Introduce Prettier (#96)

Author: ota-meshi

.eslintignore

@@ -1 +1,2 @@
+!docs/.vuepress
 docs/.vuepress/dist

.eslintrc.js

@@ -7,10 +7,12 @@ module.exports = {
     mocha: true
   },
   extends: [
-    'plugin:vue-libs/recommended'
-  ],
-  plugins: [
+    'plugin:vue-libs/recommended',
+    'plugin:prettier/recommended',
+    'prettier',
+    'prettier/vue'
   ],
+  plugins: [],
   parserOptions: {
     ecmaVersion: 2015
   },

.prettierrc

@@ -0,0 +1,5 @@
+semi: false
+singleQuote: true
+printWidth: 80
+trailingComma: none
+arrowParens: "avoid"

docs/.eslintrc.js

@@ -2,7 +2,5 @@
 
 module.exports = {
   extends: '../.eslintrc.js',
-  plugins: [
-    'markdown'
-  ]
+  plugins: ['markdown']
 }