Fix Failing Travis-CI Build (Compilation Warnings)
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- Elixir
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Description
At present the Traivs-CI build is failing because we are treating compilation warnings as "errors":
https://travis-ci.org/dwyl/hits-elixir/builds/341144484#L771

# Todo
+ [ ] go through all the compilation warnings and fix the ones that are under our control.
(_e.g we cannot "fix" the ones in `lib/plug/adapters/cowboy.ex:220` but anything **local** to our project_)
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