Merge ontologies_api_ruby_client to upstream (v2.0.3)

[syphax-bouazzouni]

Merge to the tag: v 2.0.3 (but in production used 2.0.2) Result : No conflicts

Changed files :

• Gemfile.lock
• LICENSE.txt
• README.md
• lib/ontologies_api_client/collection.rb
• ontologies_api_client.gemspec
• test/models/test_collection.rb

State:

• [x] Deployed on stage
• [x] Deployed on production