support passing options to markdown-it plugins

[mshick]

Small change here -- if the plugins array provides an object instead of a string options can be passed to the plugin.

markdown:
  plugins:
    - name: markdown-it-foo
      options:
        param: value

[mshick]

Added a test for new plugin def.

[celsomiranda]

Looks good. I'll merge it and once tested I'll publish the new version to NPM.

[sappy5678]

Is it push to npm?
I found npm and github version are different
https://github.com/hexojs/hexo-renderer-markdown-it/blob/master/lib/renderer.js#L14

Is it possible to update the npm version?

[stevenjoezhang]

@sappy5678 New version v4.0.0 & 4.1.0 released on npm