chore: release 3.1.1 (googleapis#368)

* updated CHANGELOG.md

* updated package.json

* updated samples/package.json

chore: release 3.1.0 (googleapis#364)

* updated CHANGELOG.md

* updated package.json

* updated samples/package.json

chore: release 3.0.0 (googleapis#358)

* updated CHANGELOG.md

* updated package.json

* updated samples/package.json

Release v2.3.1 (googleapis#324)

Release v2.3.0 (googleapis#290)

Release v2.2.0 (googleapis#277)

Release v2.1.2 (googleapis#271)

Release v2.1.1 (googleapis#195)

Release v2.1.0 (googleapis#165)

fix: npm link ../ before npm install in samples (googleapis#115)