Relax peer dependencies

Closes facebook#5081

Author: Timer

packages/eslint-config-react-app/package.json

@@ -11,12 +11,12 @@
     "index.js"
   ],
   "peerDependencies": {
-    "babel-eslint": "^8.2.2",
-    "eslint": "^4.1.1",
-    "eslint-plugin-flowtype": "^2.34.1",
-    "eslint-plugin-import": "^2.6.0",
-    "eslint-plugin-jsx-a11y": "^6.0.2",
-    "eslint-plugin-react": "^7.8.2"
+    "babel-eslint": "9.x",
+    "eslint": "5.x",
+    "eslint-plugin-flowtype": "2.x",
+    "eslint-plugin-import": "2.x",
+    "eslint-plugin-jsx-a11y": "6.x",
+    "eslint-plugin-react": "7.x"
   },
   "dependencies": {
     "confusing-browser-globals": "^1.0.0"