Add UWKM Streamfields (#37)

https://github.com/UWKM/uwkm_streamfields

Quite new but I can already spot a few that I could use.

README.md

@@ -74,6 +74,7 @@ Awesome Wagtail [![Awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38
 - [Wagtail Commonblocks](https://github.com/springload/wagtailblocks) - Common StreamField blocks for Wagtail.
 - [Wagtail SVGmap](https://github.com/City-of-Helsinki/wagtail-svgmap) - ImageMap functionality for Wagtail through inline SVGs.
 - [Wagtail ClearStream](https://github.com/heymonkeyriot/wagtailclearstream) - An app to make Wagtail's StreamField more modular.
+- [UWKM Streamfields](https://github.com/UWKM/uwkm_streamfields) – A basic set of Wagtail Streamfields for fun and profit.
 
 ### Static site generation