Add option tag

[anteriovieira]

import Vue from 'vue'
import VueMarkdown from 'vue-markdown'

Vue.use(VueMarkdown, {
  tag: 'md'
})

...

<md>**now I can use another tag :rocket:**</md>

now I can use another tag 🚀

[milindsingh]

Thanks @anteriovieira I have merged your PR in new repository and I am planning to maintain this package and have already merged most of the PR in my repository. Any contribution is welcomed to the new repository.

Please check https://github.com/adapttive/vue-markdown/
master: current version (with few fixes)
next: updated dependencies and few features added.

Use:
npm install @adapttive/vue-markdown

https://www.npmjs.com/package/@adapttive/vue-markdown