Commit bb5dfdb8c5acd48f17498b111db360820a50baec added a labels option to the docker-compose file format, but added it to the 3.2 schema. This patch moves the change to the 3.3 schema Signed-off-by: Sebastiaan van Stijn <github@gone.nl> Signed-off-by: Colin Hebert <hebert.colin@gmail.com>