Fix missing category backported to 0.2

0.2.1

Fix for missing category backported to 0.2

Fix errors when no main taxon set

v0.3.1

Fix missing variable

Require Sylius ^1.0 via GTM base plugin - PHP ^7.1 only

v0.3

Do not specify PHP requirement - it's implicit due to Sylius

Require ~0.1 of GtmPlugin

0.2

Require 0.1 of GTM Sylius plugin

First working version (based on Sylius beta-3)

0.1

Adjust README