[Docs] async / await for example

[VdustR]

Steps to reproduce

Write a method in any example format like this:

async onSelect (val) {
}

Which browser?

vue-material@vue-material@1.0.0-beta-7

Chrome 63.0.3239.108 (64bit) on Xubuntu

What is expected?

Transformed into onSelect: async function onSelect (val) {

What is actually happening?

It's transformed into async onSelect: function onSelect (val) { and throw error:

ERROR in ./build/loaders/component-example-loader.js!./docs/app/pages/Components/Autocomplete/examples/AutocompleteTemplate.vue
Module build failed: SyntaxError: Unexpected token, expected (61:15)
  59 |   window.alert('noop')
  60 | },
> 61 | async onSelect: function onSelect (val) {
     |               ^
  62 |   await this.$nextTick()
  63 |   this.value = val
  64 | }
    at createError$1 (/home/vipro/Documents/projects/maxwin/vue-material/node_modules/prettier/parser-babylon.js:1:50)
    at parse (/home/vipro/Documents/projects/maxwin/vue-material/node_modules/prettier/parser-babylon.js:1:793)
    at Object.parse (/home/vipro/Documents/projects/maxwin/vue-material/node_modules/prettier/index.js:4220:12)
    at formatWithCursor (/home/vipro/Documents/projects/maxwin/vue-material/node_modules/prettier/index.js:24819:22)
    at format (/home/vipro/Documents/projects/maxwin/vue-material/node_modules/prettier/index.js:24859:10)
    at Object.format (/home/vipro/Documents/projects/maxwin/vue-material/node_modules/prettier/index.js:25098:12)
    at Object.module.exports (/home/vipro/Documents/projects/maxwin/vue-material/build/loaders/component-example-loader.js:88:23)
 @ ./docs/app/pages/Components/Autocomplete/Autocomplete.vue 39:18-123
 @ ./docs/app/pages lazy ^\.\/.*$
 @ ./docs/app/config.js
 @ ./docs/app/index.js
 @ multi ./docs/app/index.js ./build/local/client

Is it possible to replace vue-template-es2015-compiler with babel with same configuration as .babelrc?

I think it's might because async / await is es2017 not es2015 and Bublé(which vue-template-es2015-compiler dependent on) is an ES2015 compiler?

Til now, we could still write onSelect: async function onSelect (val) { in our documentation example.