Add v3.0 release information to changelog (#740)

CHANGELOG.md

@@ -1,10 +1,13 @@
 # Changelog
 
+## v3.0.0
+
+- [Update to node 16](https://github.com/actions/checkout/pull/689)
+
 ## v2.3.1
 
 - [Fix default branch resolution for .wiki and when using SSH](https://github.com/actions/checkout/pull/284)
 
-
 ## v2.3.0
 
 - [Fallback to the default branch](https://github.com/actions/checkout/pull/278)