warning(Elixir 1.11.0): Fix compiler warnings emitted in most recent …

[tomciopp]

…version of elixir

Summary of changes

Fixes compiler warnings

Checklist

• [x] New functions have typespecs, changed functions were updated
• [x] Same for documentation, including moduledocs
• [x] Tests were added or updated to cover changes
• [x] Commits were squashed into a single coherent commit

Licensing/Copyright

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I certify that I own, and have sufficient rights to contribute, all source code and related material intended to be compiled or integrated with the source code for Distillery (the "Contribution"). My Contribution is licensed under the MIT License.

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[lessless]

@joaothallis @bitwalker can anyone please merge this in?

[apberr-adobe]

Seconding this request @bitwalker