jonschlinkert / remarkable / 730 / 2

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Pull #351

travis-ci

Decouple linkify in separate plugin

Closes https://github.com/jonschlinkert/remarkable/issues/343

linkify depends on autolinker which is quite heavy. The option is
disabled by default and not used most of the time.

https://bundlephobia.com/result?p=autolinker@3.1.0

In this diff I decoupled linkify into plugin which can be accessed like
this

```js
import Remarkable from 'remarkable';
import linkify from 'remarkable/linkify';

const md = new Remarkable({ html: true })
  .use(linkify);
```

For UMD build linkify provided out of the box

```js
const md = new window.Remarkable({ html: true })
  .use(window.Remarkable.linkify);
```

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