Merge branch 'release/v0.3.6' into develop

* release/v0.3.6:
  Bumping version and updating CHANGELOG for v0.3.6
TwitterHashtagStream added endpoint to gem
Updating change log
Merge branch 'release/v0.3.7'

* release/v0.3.7:
  Updating change log
  TwitterHashtagStream added endpoint to gem