chore: release 2.0.0 (#63)

🤖 I have created a release \*beep\* \*boop\* 
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## [2.0.0](https://www.github.com/googleapis/nodejs-secret-manager/compare/v1.2.1...v2.0.0) (2020-02-28)


### ⚠ BREAKING CHANGES

* drop support for Node 8 (which is EOL) (#64)
* library now uses v1 API surface (#62)

### Features

* drop support for Node 8 (which is EOL) ([#64](https://www.github.com/googleapis/nodejs-secret-manager/issues/64)) ([e4118ef](https://www.github.com/googleapis/nodejs-secret-manager/commit/e4118ef699ff63e005f65b154fb2b3a379e3cfd1))
* export protos in src/index.ts ([46e2c3e](https://www.github.com/googleapis/nodejs-secret-manager/commit/46e2c3e5b598dbd3eefeec859f52fffa32bdf63c))
* library now uses v1 API surface ([#62](https://www.github.com/googleapis/nodejs-secret-manager/issues/62)) ([a8368d4](https://www.github.com/googleapis/nodejs-secret-manager/commit/a8368d465c8577f708d3185d60c26b7e652befbe))
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This PR was generated with [Release Please](https://github.com/googleapis/release-please).

secret-manager/package.json

@@ -14,7 +14,7 @@
     "test": "c8 mocha --recursive test/ --timeout=800000"
   },
   "dependencies": {
-    "@google-cloud/secret-manager": "^1.2.1"
+    "@google-cloud/secret-manager": "^2.0.0"
   },
   "devDependencies": {
     "c8": "^7.0.0",