Configure and run formatter#75

Merged

RyanSiu1995 merged 8 commits intomweibel:masterfrom

ImmaculatePine:configure-formatter

Aug 14, 2019

Commits on Aug 13, 2019

Configure formatter and run it
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Add formatter check to mix quality task
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Add latest Elixir and OTP versions to Travis config
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Configure Travis matrix as list of inclusions instead of list of exclusions
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Only specify the exact combinations of configurations in Travis config
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Run formatter check only on the latest Elixir version
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Remove OTP 18.1 from Travis matrix since its archive is missing
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Remove Elixir 1.4 from Travis matrix since credo compilation fails on this version
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