[chore] Updated eslint and a few related deps

Author: Aditya Vohra

Diff for: package.json

@@ -24,17 +24,17 @@
   "devDependencies": {
     "babel-cli": "^6.26.0",
     "babel-core": "^6.25.0",
-    "babel-eslint": "^8.0.0",
+    "babel-eslint": "^8.0.1",
     "babel-loader": "^7.1.2",
     "babel-plugin-add-module-exports": "^0.2.1",
     "babel-preset-es2015": "^6.24.1",
     "babel-preset-react": "^6.24.1",
     "babel-preset-stage-2": "^6.24.1",
     "coveralls": "^2.13.1",
     "cross-env": "^5.0.1",
-    "eslint": "^4.7.1",
+    "eslint": "^4.8.0",
     "eslint-plugin-jsx-a11y": "^6.0.2",
-    "eslint-plugin-react": "^7.1.0",
+    "eslint-plugin-react": "^7.4.0",
     "gitbook-cli": "^2.3.0",
     "istanbul-instrumenter-loader": "^3.0.0",
     "karma": "^1.3.0",

Diff for: src/helpers/ariaAppHider.js

@@ -31,10 +31,11 @@ export function tryForceFallback() {
 export function validateElement(appElement) {
   if (!appElement && !globalElement && !tryForceFallback()) {
     throw new Error([
-      'react-modal: Cannot fallback to `document.body`, because it\'s not ready or available.',
-      'If you are doing server-side rendering, use this function to defined an element.',
-      '`Modal.setAppElement(el)` to make this accessible'
-    ]);
+      'react-modal: Cannot fallback to `document.body`, because it is not',
+      'ready or available. If you are doing server-side rendering, use this',
+      'function to defined an element. `Modal.setAppElement(el)` to make',
+      'this accessible',
+    ].join(' '));
   }
 }