Streamfield support

[SalahAdDin]

• Python 3.6.4.
• Django 2.0.1.
• Wagtail 2.0b1.
• Chrome 64.

I think many users implements StreamField for the body content. I'm not sure about if this package support StreamFields but it could be a good idea.

[Parbhat]

@SalahAdDin The package supports StreamField from version 0.0.4. We have not tested it with Wagtail 2.0b1 but it will surely be breaking as it is a major release. We will update the package when 2.0 stable is released. Thanks.