added eslint-prettier reconciler plugin

Author: Williammer

.eslintrc

@@ -1,7 +1,8 @@
 {
-  "extends": ["airbnb-base", "plugin:jest/recommended"],
-  "plugins": ["jest"],
+  "extends": ["airbnb-base", "plugin:jest/recommended", "plugin:prettier/recommended"],
+  "plugins": ["jest", "prettier"],
   "rules": {
+    "prettier/prettier": 1,
     "max-len": 1,
     "quotes": [1, "double"],
     "object-curly-newline": 1,

.prettierrc

@@ -1,5 +1,5 @@
 {
-  "trailingComma": "es5",
+  "trailingComma": "all",
   "printWidth": 100,
   "arrowParens": "always"
 }

package-lock.json

@@ -33,12 +33,14 @@
     "codecov": "^3.0.4",
     "eslint": "^5.3.0",
     "eslint-config-airbnb-base": "^13.1.0",
+    "eslint-config-prettier": "^3.0.1",
     "eslint-plugin-import": "^2.14.0",
+    "eslint-plugin-jest": "^21.21.0",
+    "eslint-plugin-prettier": "^2.6.2",
     "fs-extra": "^7.0.0",
     "jest": "^23.5.0",
     "jest-html-reporter": "^2.4.2",
-    "prettier": "^1.14.2",
-    "eslint-plugin-jest": "^21.21.0"
+    "prettier": "^1.14.2"
   },
   "jest-html-reporter": {
     "pageTitle": "leetcode-js test suite",