v0.21.1

Patch release to bring in updates to [email protected] so it no longer emits deprecation warnings with grpc (#120), along with other dependency updates and documentation changes.

Dependencies

• fix(deps): update dependency google-gax to ^0.18.0 (#146)
• chore: drop dependency on common (#134)
• chore(deps): update dependency eslint-plugin-node to v7 (#127)

Documentation

• Code Samples demonstrating Object Localization & Handwriting OCR (#133)

Internal / Testing Changes

• build: initial kokoro setup (#145)
• chore: assert.deelEqual => assert.deepStrictEqual (#143)
• chore: move mocha options to mocha.opts (#141)
• chore: require node 8 for samples (#142)
• chore: add node templates to synth.py (#139)
• fix(deps): update dependency @google-cloud/vision to ^0.21.0 (#131)