Update eslint and related deps (#254)

Author: Aditya Vohra

.eslintrc

@@ -0,0 +1,25 @@
+module.exports = {
+  parser: 'babel-eslint',
+  extends: 'eslint:recommended',
+  rules: {
+    'comma-dangle': ['error', 'always-multiline'],
+    'no-underscore-dangle': 'off',
+    quotes: ['error', 'single', 'avoid-escape'],
+    strict: 'off',
+    'no-unused-vars': 'error',
+    'no-undef': 'error'
+  },
+  env: {
+    node: true,
+    es6: true
+  },
+  globals: {
+    ASTNode: true,
+    FlowTypeDescriptor: true,
+    Handler: true,
+    NodePath: true,
+    PropDescriptor: true,
+    PropTypeDescriptor: true,
+    Resolver: true
+  }
+}

.eslintrc.js

@@ -6,7 +6,7 @@
  * LICENSE file in the root directory of this source tree. An additional grant
  * of patent rights can be found in the PATENTS file in the same directory.
  */
-"use strict";
+'use strict';
 
 function stringOfLength(string, length) {
   var newString = '';

example/generateMarkdown.js

@@ -43,14 +43,14 @@
   "devDependencies": {
     "babel-cli": "^6.26.0",
     "babel-core": "^6.26.0",
-    "babel-eslint": "^7.0.0",
+    "babel-eslint": "^8.2.2",
     "babel-jest": "^21.2.0",
     "babel-plugin-transform-object-rest-spread": "^6.26.0",
     "babel-plugin-transform-runtime": "^6.23.0",
     "babel-preset-env": "^1.6.1",
     "babel-preset-flow": "^6.23.0",
     "cross-spawn": "^5.0.0",
-    "eslint": "^4.3.0",
+    "eslint": "^4.18.1",
     "flow-bin": "^0.59.0",
     "jest": "^21.2.1",
     "jest-diff": "^21.2.1",