docs(upgrade) list more 0.14 breaking changes (#5365)

Added the Breaking Changes missing for Upgrade to 0.14.x

UPGRADE.md

@@ -1093,6 +1093,14 @@ complete list of changes and new features.
   it if you are using a custom template. The changes are detailed in a diff
   included below.
 
+##### Plugins
+- The Runscope plugin has been dropped, based on the EoL announcement made by Runscope about their Traffic Inspector product. [#3495](https://github.com/Kong/kong/pull/3495)
+
+##### Admin API
+- The SSL Certificates and SNI entities have moved to the new DAO implementation. As such, the /certificates and /snis endpoints have received notable usability improvements, but suffer from a few breaking changes. [#3386](https://github.com/Kong/kong/pull/3386)
+
+- The Consumers entity has moved to the new DAO implementation. As such, the `/consumers` endpoint has received notable usability improvements, but suffers from a few breaking changes. [#3437](https://github.com/Kong/kong/pull/3437)
+
 <details>
 <summary><strong>Click here to see the Nginx configuration changes</strong></summary>
 <p>