Make tsc ignore addons.

[mrstegeman]

No description provided.

[codecov-io]

Codecov Report

Merging #662 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #662   +/-   ##
=======================================
  Coverage   80.33%   80.33%           
=======================================
  Files          81       81           
  Lines        3270     3270           
  Branches      409      409           
=======================================
  Hits         2627     2627           
  Misses        597      597           
  Partials       46       46

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[hobinjk]

@mrstegeman You can ignore all of build if you want to since the only files that go there are ones that tsc is done processing.