----------   Version 3.3   ----------
save to a file feature redirects to the feed (instead of showing the file location)
option to include only selected categories in the feed
image cache refresh can be disabled - hugely increases speed
other improvements and bugfixes

----------   Version 3.3.1   ----------
improved remove of control characters in the feed
improved google taxonomy categories in the feed
other improvements and bugfixes

----------   Version 3.4   ----------
new file location - if you are using cron jobs, please update the feed file urls
csv/xml feed file location changed to root oc1 & oc2
modified xml header for chrome web browser
improved image cache with a new option
improved database access in the feeds
new settings for 0 quantity and disabled products
removed meta description setting (meta description is used if available)
other improvements and bugfixes

----------   Version 3.4.1   ----------
added an option to select description source
improved multi store support
multiple product types are now separated by comma
other improvements and bugfixes

----------   Version 3.4.2   ----------
added support for additional images
improved special character support
improved option based price calculations
url parameter category_id changed to cat_id for better compatibility
other improvements and bugfixes

UPDATE INFO v4.0.0
The extension uses new settings, so please check and re-save all feed settings.

----------   Version 4.0.0   ----------
reworked settings & feeds
new feature to bypass server restrictions
added automatic option selection via product url
added product options to the Facebook feed
added support for pattern and material fields (Facebook & Merchant Center)
improved color and size options
added currency and language as setting
added include product url parameter
added exclude category url parameter
improved PHP 7.2 support
other improvements and bugfixes

----------   Version 4.0.1   ----------
added gender/age to the Facebook feed (apparel only)
added URL parameter to set the store
fix for multi-store feed
other improvements and bugfixes

----------   Version 4.0.2   ----------
added inventory field to the Facebook feed
added &image_domain URL parameter
fixed merchant center feed settings save button (oc3)
other improvements and bugfixes

----------   Version 4.0.3   ----------
added URL parameter to filter products by manufacturers
added URL parameter to filter products by meta keywords
fixed the google taxonomy filter feature in the categories (oc1 & oc2)
other improvements and bugfixes

----------   Version 5.0.0   ----------
new custom feeds
improved datetime format
improved save to file feature
other improvements and bugfixes

----------   Version 5.0.1   ----------
added product range URL parameter
added use_age_group & use_gender URL parameter
added merchant center shipping calculations
performance improvements
other improvements and bugfixes

----------   Version 5.0.2   ----------
added GZIP compression
improved settings
added custom feed config file support
added remove_char, html_entities_url and html_entities_text URL parameter (custom feed)
improved option/attributes system (custom feed)
other improvements and bugfixes

----------   Version 5.0.2.1   ----------
custom feed save to file fix

----------   Version 5.1.0   ----------
added new custom keywords (calculate, round/precision, additional_image_index, custom_category_name, custom_category_id)
added custom category (custom feed re-install required)
simplified custom feed lists
currency compatibility improvements
added feed templates download button
other improvements and bugfixes

----------   Version 5.1.1   ----------
added customer_group url parameter
other improvements and bugfixes(shipping_price = 0 fix)

----------   Version 5.1.2   ----------
added cache control header
added multi language/currency support in a single feed (custom feeds)
added new replace keywords (custom feeds)
other improvements and bugfixes

----------   Version 5.1.3   ----------
added &include_free URL parameter to enable/disable products with 0 price
other minor improvements and bugfixes

----------   Version 5.1.4   ----------
added price range URL parameter
added rating/reviews to custom feeds
added support for option images modules
improved support for external modules
other minor improvements and bugfixes

----------   Version 5.2.0   ----------
added gtin source setting
improved language support
other improvements and bugfixes

----------   Version 5.2.1   ----------
added product filters to custom feeds
added related products to custom feeds
improved language support
other improvements and bugfixes

----------   Version 5.3.0   ----------
added availability date to Merchant Center & Custom feeds
fixed filters in the Custom feed
fixed related product urls in the Custom feed
removed gzip compression from Adwords feed

----------   Version 5.4.0   ----------
added unsupported variants (Merchant & Facebook)
added minimum quantity check
added "in stock" status setting (Merchant & Facebook)
added option to not use GTIN (Merchant & Facebook)
added sell with checkout (Facebook)
added new custom feeds keyword

----------   Version 5.4.1   ----------
improved feed creation speed
fixed php 5.4 support
other improvements and bugfixes

----------   Version 5.4.2   ----------
fixed missing shop description in some opencart versions (custom feeds)
changed product type sort order (merchant feed only)
fixed possible image php error
other improvements and bugfixes

----------   Version 5.4.3   ----------
added item condition (facebook & google feeds)
other improvements and bugfixes
added custom feed parameter &fi

----------   Version 5.4.4   ----------
added product filters for size, color, pattern and material
added new custom feed keywords
added basic gtin validation
added adult only products (merchant feed)
added identifier_exists if brand, gtin and mpn is not set (merchant feed)
fixed unsupported product variants
other improvements and bugfixes

----------   Version 5.4.5   ----------
added product SKU
improved external extension support
other improvements and bugfixes

!!!UPDATE INFO!!!
If you upgrade from an older version (5.X or older) to version 6.X some settings might get lost (due to the settings re-design), so please backup your settings first.

----------   Version 6.0.0   ----------
added opencart 4 support
complete settings redesign (merged feed settings)
attribute, filter options are no longer combined
other improvements and bugfixes

----------   Version 6.0.1   ----------
improved save to file redirection
fixed missing custom category settings (only oc 4.X)
fixed extension uninstall (only oc 4.X)
other improvements and bugfixes

----------   Version 6.0.2   ----------
added energy efficiency class
improved save to file redirection
improved merchant feed shipping
fixed php 8 compatibility
fixed installing (from oc 4.0.0.1)
fixed default settings (from oc 4.X)
other improvements and bugfixes
improved shipping
improved custom feed performance
complete new settings (oc 1,2,3)

----------   Version 6.0.3   ----------
added: custom labels (facebook & google feeds)
other minor improvements and bugfixes

----------   Version 6.2.0   ----------
improved compatibility
added disabled_capabilities (facebook feed)
added unit_pricing_measure and unit_pricing_base_measure (merchant feed)
fixed tax setting (merchant feed)
anonymized review author (custom feed)
fixed category (custom feed)
other improvements and bugfixes

----------   Version 6.2.1   ----------
fixed false warning in the extension settings
improved compatibility
other improvements and bugfixes

----------   Version 7.0.0   ----------
added new color/size options for custom feeds
added mpn source setting
updated merchant center stock statuses
fixed shipping tax
fixed weight (custom feed)
improved option sorting
added custom keywords #size#, #product_size_list#, #product_color_list# and #location#
added custom dynamic keywords #availability... and #value...
#variations# replaced by #variants#
#option_quantity# replaced by #variant_quantity#
other improvements and bugfixes

----------   Version 7.1.0   ----------
feed performance improvements
added default gender & age_group
added empty values for age_group, gender and taxonomy categories
settings design improvement
fixed image size setting missing cache options
fixed filter value (custom feeds)
added empty sale price check
other improvements and bugfixes

----------   Version 7.1.1   ----------
taxonomy category list tables replaced by files (feeds)
added keyword #sale_percentage# (custom feeds)
fixed new category saving
other improvements and bugfixes

----------   Version 7.1.2   ----------
fixed business data feed