Fix some typos

[codecov-io]

Codecov Report

Merging #4 into master will decrease coverage by 0.38%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master       #4      +/-   ##
==========================================
- Coverage   77.16%   76.78%   -0.39%     
==========================================
  Files          19       19              
  Lines         784      784              
  Branches       91       91              
==========================================
- Hits          605      602       -3     
- Misses        179      182       +3

Impacted Files	Coverage Δ
...itter/src/main/scala/arrows/twitter/ArrowRun.scala	94.44% <0%> (-4.17%)	:arrow_down:

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[fwbrasil]

thank you @Philippus :)