chore: release 4.0.0

[yoshi-automation]

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

4.0.0 (2019-05-20)

⚠ BREAKING CHANGES

• deps: this will ship async/await with the generated code.
• upgrade engines field to >=8.10.0 (build!: upgrade engines field to >=8.10.0 #424)
• This removes the autoCreate option which may result in a breaking change for TypeScript users.

Bug Fixes

• deps: update dependency @google-cloud/common to ^0.32.0 (8e28b62), closes #8203
• deps: update dependency @google-cloud/common to v1 (#434) (0e4aeef)
• deps: update dependency @google-cloud/paginator to v1 (#428) (5d925af)
• deps: update dependency @google-cloud/promisify to v1 (#427) (fdeb862)
• deps: update dependency arrify to v2 (de0f687)
• table: allow for TableSchema to be used (#438) (7995be0)
• types: correct interface (#407) (da5ed01)
• correctly encode nested struct/array params (#439) (d7006bd)
• remove teeny-request as a direct dependency (#412) (c6de54a)

Build System

• upgrade engines field to >=8.10.0 (#424) (cea017e)

Code Refactoring

• drop autoCreate in table.insert in favor of schema (#421) (b59cd7f)

Miscellaneous Chores

• deps: update dependency gts to v1 (#419) (7b0e76a)

[codecov]

Codecov Report

Merging #445 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #445   +/-   ##
======================================
  Coverage    99.4%   99.4%           
======================================
  Files           4       4           
  Lines         674     674           
  Branches      189     189           
======================================
  Hits          670     670           
  Misses          2       2           
  Partials        2       2

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