setup husky, prettier, lint-staged

package.json

@@ -7,10 +7,22 @@
     "react-dom": "^16.5.0",
     "react-scripts": "1.1.5"
   },
+  "devDependencies": {
+    "husky": "^0.14.3",
+    "lint-staged": "^7.2.2",
+    "prettier": "^1.14.2"
+  },
   "scripts": {
+    "precommit": "lint-staged",
     "start": "react-scripts start",
     "build": "react-scripts build",
     "test": "react-scripts test --env=jsdom",
     "eject": "react-scripts eject"
+  },
+  "lint-staged": {
+    "src/**/*.{js,jsx,json,css}": [
+      "prettier --single-quote --write",
+      "git add"
+    ]
   }
 }