Upgrade ESLint to 5.1.0

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

- eslint/eslint#10560
- eslint/eslint#10512

Differential Revision: D8767118

fbshipit-source-id: 2048829d780b5f0f2f607114f803c8d0c3e02ca7

modules/eslint-plugin-nuclide-internal/package.json

@@ -11,7 +11,7 @@
   },
   "devDependencies": {
     "babel-eslint": "8.2.5",
-    "eslint": "5.0.1",
+    "eslint": "5.1.0",
     "idx": "1.2.0",
     "resolve-from": "2.0.0",
     "temp": "0.8.3"