Change prettier workflow to git hook (#25)

package.json

@@ -27,8 +27,21 @@
     "babel-eslint": "^10.1.0",
     "eslint": "^6.7.2",
     "eslint-plugin-vue": "^6.2.2",
+    "husky": "^4.3.0",
+    "lint-staged": "^10.5.1",
+    "prettier": "^2.1.2",
     "vue-template-compiler": "^2.6.11"
   },
+  "husky": {
+    "hooks": {
+      "pre-commit": "lint-staged"
+    }
+  },
+  "lint-staged": {
+    "*.{js,css,md}": [
+      "prettier --tab-width 4 --jsx-bracket-same-line true --write"
+    ]
+  },
   "eslintConfig": {
     "root": true,
     "env": {