Changes

#50: Release 2.1.0 by @Progi1984
#49: Bump version to 2.1.0 by @Progi1984
#45: Fixed check of the status of checkboxes by @Progi1984
#46: Project Improvements by @Progi1984
#48: Add CONTRIBUTORS file by @matks
#47: Add AFL LICENSE file by @matks
#26: add mail table for cleaning by @nenes25
#23: Deleting from category_group and setting auto_increment by @sadlyblue
#44: Enable Release Drafter by @matks
#43: Add GitHub PR template by @matks
#42: Update readme to add multistore compatibility by @marionf
#40: remove duplicated tables in getCatalogRelatedTables() by @nenes25
#39: remove attribute_impact declared twice by @nenes25
#25: Remove Older Ps versions conditions by @nenes25
#20: Fix missing table in Catalog Related Tables by @prestarocket
#27: Blank lines by @MathiasReker
#30: Cast spaces by @MathiasReker
#32: Single quote by @MathiasReker
#33: Lossless compression by @MathiasReker
#21: Add cart_rule_lang in Check And Fix to delete old cart rule's names. by @Uebix
#34: Happy new year 2019 by @MathiasReker
#16: Delete CHANGELOG.txt by @prestamodule
#24: Truncate the attribute table also by @sadlyblue

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