Merge pull request #1894 from mozilla/greenkeeper/eslint-plugin-jest-21.14.0

Update eslint-plugin-jest to the latest version 🚀

package.json

@@ -52,7 +52,7 @@
     "deepmerge": "2.1.0",
     "eslint-config-amo": "1.6.0",
     "eslint-plugin-async-await": "0.0.0",
-    "eslint-plugin-jest": "21.12.3",
+    "eslint-plugin-jest": "21.14.0",
     "eslint-plugin-promise": "3.5.0",
     "gfm.css": "1.1.2",
     "grunt": "1.0.2",