chore: release 2.2.0

[yoshi-automation]

🤖 I have created a release *beep* *boop*

2.2.0 (2019-06-20)

Features

• adds additional updaters/logic for PHP mono-repo (#195) (728aa86)

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This PR was generated with Release Please.

[codecov]

Codecov Report

Merging #196 into master will decrease coverage by 0.84%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #196      +/-   ##
==========================================
- Coverage   72.63%   71.78%   -0.85%     
==========================================
  Files          15       15              
  Lines        2123     2123              
  Branches      182      180       -2     
==========================================
- Hits         1542     1524      -18     
- Misses        571      584      +13     
- Partials       10       15       +5

Impacted Files	Coverage Δ
src/graphql-to-commits.ts	89.16% <0%> (-3.34%)	⬇️
src/github.ts	56.38% <0%> (-1.87%)	⬇️

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[yoshi-automation]

Release is at https://github.com/googleapis/release-please/releases/tag/v2.2.0

[yoshi-automation]

The release build has started, the log can be viewed here. 🌻

[yoshi-automation]

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