chore(package): update eslint-config-omaha-prime-grade to version 12.0.0

Closes #155

Author: greenkeeper[bot]

package.json

@@ -42,7 +42,7 @@
     "coveralls": "^3.0.0",
     "del-cli": "^1.1.0",
     "eslint": "^4.1.1",
-    "eslint-config-omaha-prime-grade": "^10.0.0",
+    "eslint-config-omaha-prime-grade": "^12.0.0",
     "eslint-plugin-compat": "^2.2.0",
     "eslint-plugin-promise": "^3.6.0",
     "flow-bin": "^0.73.0",