chore: release 1.5.0 (#145)

🤖 I have created a release \*beep\* \*boop\* 
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## [1.5.0](https://www.github.com/googleapis/nodejs-datalabeling/compare/v1.4.2...v1.5.0) (2020-02-29)


### Features

* export protos in src/index.ts ([42812db](https://www.github.com/googleapis/nodejs-datalabeling/commit/42812db5f9c56b744c32314aaf4e7c48c13a62b1))
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This PR was generated with [Release Please](https://github.com/googleapis/release-please).

datalabeling/package.json

@@ -14,7 +14,7 @@
     "test": "mocha --timeout 600000"
   },
   "dependencies": {
-    "@google-cloud/datalabeling": "^1.4.2"
+    "@google-cloud/datalabeling": "^1.5.0"
   },
   "devDependencies": {
     "chai": "^4.2.0",