Upgrade ESLint to 5.1.0

Summary:
This release fixes several issues. Most importantly for us:

- https://github.com/eslint/eslint/issues/10560
- https://github.com/eslint/eslint/issues/10512

Differential Revision: D8767118

fbshipit-source-id: 2048829d780b5f0f2f607114f803c8d0c3e02ca7

package.json

@@ -203,7 +203,7 @@
     "async": "^2.4.0",
     "babel-eslint": "9.0.0-beta.2",
     "babel-generator": "^6.26.0",
-    "eslint": "5.0.1",
+    "eslint": "5.1.0",
     "eslint-config-fb-strict": "22.1.0",
     "eslint-config-fbjs": "2.0.1",
     "eslint-plugin-eslint-comments": "^3.0.1",