Add Prettier configuration

Author: HiDeoo

.eslintrc

@@ -11,7 +11,7 @@
     "jest"
   ],
   "rules": {
-    "prettier/prettier": [2, { printWidth: 120, singleQuote: true, trailingComma: "es5" }],
+    "prettier/prettier": 2,
     "react/jsx-filename-extension": 0,
     "import/no-extraneous-dependencies": [2, { devDependencies: true }],
     "no-underscore-dangle": 0,

.prettierrc

@@ -0,0 +1,5 @@
+{
+  "printWidth": 120,
+  "singleQuote": true,
+  "trailingComma": "es5"
+}

package-lock.json

@@ -31,7 +31,7 @@
     "eslint-plugin-import": "^2.3.0",
     "eslint-plugin-jest": "^20.0.3",
     "eslint-plugin-jsx-a11y": "^5.0.3",
-    "eslint-plugin-prettier": "^2.1.1",
+    "eslint-plugin-prettier": "^2.4.0",
     "eslint-plugin-react": "^7.0.1",
     "husky": "^0.13.4",
     "intro.js": "^2.8.0-alpha.1",
@@ -65,7 +65,7 @@
   "homepage": "https://github.com/HiDeoo/intro.js-react#readme",
   "lint-staged": {
     "*.js": [
-      "prettier --single-quote --trailing-comma es5 --print-width 120 --write",
+      "prettier --write",
       "git add"
     ]
   },