chore(package): update eslint to version 5.0.0 (#92)

Author: greenkeeper[bot]

packages/google-cloud-speech/package.json

@@ -77,7 +77,7 @@
     "@google-cloud/nodejs-repo-tools": "^2.3.0",
     "async": "^2.6.1",
     "codecov": "^3.0.2",
-    "eslint": "^4.19.1",
+    "eslint": "^5.0.0",
     "eslint-config-prettier": "^2.9.0",
     "eslint-plugin-node": "^6.0.1",
     "eslint-plugin-prettier": "^2.6.0",