Fix DEFAULT keyword in generated protobuf class

[michaelbausor]

• Add a test that instantiates all of the generated protobuf classes in src/generated
• Rename instance of invalid DEFAULT keyword

[garrettjonesgoogle]

PHP, you are weird.

This looks reasonable to me, but since I don't have much familiarity with the things you are calling, let someone else look too.

[codecov-io]

Codecov Report

Merging #94 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #94   +/-   ##
=======================================
  Coverage   90.52%   90.52%           
=======================================
  Files          33       33           
  Lines        2249     2249           
=======================================
  Hits         2036     2036           
  Misses        213      213

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[michaelbausor]

@shinfan @neozwu Can either of you take a look? If possible I would like to merge this today. Thanks!

[shinfan]

LGTM