Bump version 0.1.0

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Update to Elixir 0.13.1
Update .travis.yml
Add /cache
Update TODO on README.md

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Use `Base` module for conversions and handle bad requests gracefully
Merge pull request #1 from lexmag/master

Use `Base` module for conversions and handle bad requests gracefully
Use ~W sigil where possible!

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Update dependencies

Change the way test deps are fetched as well
Support multiple values same key on /get
Deploy to heroku

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