Use with context manager and a few PEP8 changes.

[anticwitee]

-First File is opened using the with context manager
-Broke two long strings into multiple lines
-Add space between arguments in a method call

[SendGridDX]

All committers have signed the CLA.

[codecov-io]

Codecov Report

Merging #455 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #455   +/-   ##
=======================================
  Coverage   82.41%   82.41%           
=======================================
  Files           9        9           
  Lines        1001     1001           
  Branches      160      160           
=======================================
  Hits          825      825           
  Misses         86       86           
  Partials       90       90

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[thinkingserious]

Hello @THE-WHITE-WOLF,

Thanks again for the PR!

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Team SendGrid DX