Upgrade to 0.13
Update .travis.yml
Bump hackney to v0.12.1

Fix a git error "reference is not in tree" for erlang-idna library
when trying to run `mix deps.get`
Merge pull request #216 from stevedomin/bump-hackney-version

Bump hackney to v0.12.1
Merge pull request #217 from dynamo/0.13

0.13