chore: release 2.1.0

[release-please]

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

2.1.0 (2020-06-16)

Features

• add order field to TagField and TagTemplateField (#157) (70c23c2)
• move ts target to es2018 from es2016 (#172) (e354dde)
• promote library to GA (#177) (ac11090)

Bug Fixes

• proper fallback option handling (51df672)
• regenerate unit tests (#163) (4593117)
• synth.py clean up for multiple version (#167) (c799604)

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This PR was generated with Release Please.

[codecov]

Codecov Report

Merging #160 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #160   +/-   ##
=======================================
  Coverage   98.35%   98.35%           
=======================================
  Files           8        8           
  Lines       11581    11581           
  Branches      419      419           
=======================================
  Hits        11390    11390           
  Misses        187      187           
  Partials        4        4           

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[yoshi-automation]

Release is at https://github.com/googleapis/nodejs-datacatalog/releases/tag/v2.1.0