Use commons main branch as default

Author: yuanzhou

docker/docker-compose.development.yml

@@ -9,8 +9,8 @@ services:
       # Will also need to use the 'git+https://github.com/hubmapconsortium/commons.git@${COMMONS_BRANCH}#egg=hubmap-commons'
       # in src/requirements.txt accordingly
       # args:
-      #   # The commons github branch to be used during image build (default to master if not set or null)
-      #   - COMMONS_BRANCH=${COMMONS_BRANCH:-master}
+      #   # The commons github branch to be used during image build (default to main if not set or null)
+      #   - COMMONS_BRANCH=${COMMONS_BRANCH:-main}
     # Build the image with name and tag
     # Exit with an error message containing err if unset or empty in the environment
     image: hubmap/entity-api:${ENTITY_API_VERSION:?err}