chore: release 3.8.0 (#381)

🤖 I have created a release \*beep\* \*boop\* 
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## [3.8.0](https://www.github.com/googleapis/nodejs-language/compare/v3.7.2...v3.8.0) (2020-02-28)


### Features

* export protos in src/index.ts ([482fb10](https://www.github.com/googleapis/nodejs-language/commit/482fb10bc1d4f01bd3de38a0301cda2a2efb491d))
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This PR was generated with [Release Please](https://github.com/googleapis/release-please).

cloud-language/snippets/package.json

@@ -17,7 +17,7 @@
   "dependencies": {
     "@google-cloud/automl": "^1.0.0",
     "mathjs": "^6.0.0",
-    "@google-cloud/language": "^3.7.2",
+    "@google-cloud/language": "^3.8.0",
     "@google-cloud/storage": "^4.0.0",
     "yargs": "^15.0.0"
   },