Add Wagtail meta preview (#144)

README.md

@@ -119,6 +119,7 @@ Awesome Wagtail [![Awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38
 - [wagtail-schema.org](https://github.com/takeflight/wagtail-schema.org) - Schema.org JSON-LD tags for Wagtail sites.
 - [wagtail-opengraph-image-generator](https://github.com/candylabshq/wagtail-opengraph-image-generator) - Assists you in automatically creating Open Graph images for your Wagtail pages.
 - [wagtail-redirect-importer](https://github.com/Frojd/wagtail-redirect-importer) - Your friendly neighborhood importer that lets you import redirects from different tabular data formats, such as .csv and .xls 
+- [wagtail-meta-preview](https://github.com/rinti/wagtail-meta-preview) - Adds ability to get share previews for Facebook, Twitter and Google in the Wagtail admin.
 
 ### Analytics