Release note for StreamField design update (#5476)

CHANGELOG.txt

@@ -4,6 +4,7 @@ Changelog
 2.7 LTS (xx.xx.xxxx) - IN DEVELOPMENT
 ~~~~~~~~~~~~~~~~~~~~
 
+ * Improved StreamField design (Bertrand Bordage)
  * Added `construct_page_listing_buttons` hook (Michael van Tellingen)
  * Added more detailed documentation and troubleshooting for installing OpenCV for feature detection (Daniele Procida)
  * Added Table Block caption for accessibility (Rahmi Pruitt)

SPONSORS.md

@@ -0,0 +1,17 @@
+# Sponsors
+
+The following organisations and individuals supported the [Wagtail's First Hatch](https://www.kickstarter.com/projects/noripyt/wagtails-first-hatch) crowdfunding campaign:
+
+- [Springload](https://springload.nz/)
+- [NetFM](https://netfm.org/)
+- [Ambient Innovation](https://ambient-innovation.com/)
+- [Shenberger Technology](http://shenbergertech.com/)
+- [Type/Code](https://typecode.com/)
+- [SharperTool](http://sharpertool.com/)
+- [Overcast Software](https://www.overcast.io/)
+- [Octave](https://octave.nz/)
+- [Taywa](https://www.taywa.ch/)
+- [Rock Kitchen Harris](https://www.rkh.co.uk/)
+- [The Motley Fool](http://www.fool.com/)
+- [R Strother Scott](https://twitter.com/rstrotherscott)
+- [Beyond Media](http://beyond.works/)

docs/releases/2.7.rst

@@ -13,7 +13,12 @@ Wagtail 2.7 is designated a Long Term Support (LTS) release. Long Term Support r
 What's new
 ==========
 
-* Upgraded Elasticsearch client library dependency to 6.4.0 or above, 7.0.0 or above is still supported.
+Improved StreamField design
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. image:: ../_static/images/releasenotes_2_7_streamfield_styles.png
+
+The design of the StreamField user interface has been updated to improve clarity and usability, including better handling of nested blocks. This work was completed by Bertrand Bordage as part of the `Wagtail's First Hatch <https://www.kickstarter.com/projects/noripyt/wagtails-first-hatch>`_ crowdfunding campaign. We would like to thank all `supporters of the campaign <https://wagtail.io/blog/wagtails-first-hatch-backers/>`_.
 
 
 Other features