Determinator Tracking middleware

• Determinator::Tracking is a Rack middleware for capturing requests and their subsequent determinations. Experimentation Platform is using this information to build engineering metric monitoring for experiments. Please see the internal example for implementation guidance.

Version 2.0.0

Breaking change:

• Removes routemaster-drain support, the gem is also no longer a dependency. (#55)

Feature:

• Adds retriever for Dynaconf. (#55)

Version 0.4.0

Merge pull request #13 from deliveroo/version-bump

Version bump