chore: release 1.6.0 (#147)

🤖 I have created a release \*beep\* \*boop\* 
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## [1.6.0](https://www.github.com/googleapis/nodejs-datalabeling/compare/v1.5.0...v1.6.0) (2020-03-06)


### Features

* deferred client initialization ([#146](https://www.github.com/googleapis/nodejs-datalabeling/issues/146)) ([cbd8224](https://www.github.com/googleapis/nodejs-datalabeling/commit/cbd82248f93360815e17dbf50098ad3a3ec6360a))
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This PR was generated with [Release Please](https://github.com/googleapis/release-please).

Author: release-please[bot]

datalabeling/package.json

@@ -14,7 +14,7 @@
     "test": "mocha --timeout 600000"
   },
   "dependencies": {
-    "@google-cloud/datalabeling": "^1.5.0"
+    "@google-cloud/datalabeling": "^1.6.0"
   },
   "devDependencies": {
     "chai": "^4.2.0",