Update NOTES_ON_CODEPUSH.md

Add a note soliciting patches to add to our list of OTA/codepush solutions.

NOTES_ON_CODEPUSH.md

@@ -2,10 +2,15 @@
 
 Just place to keep running notes about our development of codepush for Flutter.
 
-# Other known codepush implementations
+# Other known over-the-air update implementations
 
 * https://github.com/microsoft/code-push
 * https://github.com/Tencent/tinker
 * https://github.com/expo/expo/tree/main/packages/expo-updates
 * https://github.com/hydro-sdk/hydro-sdk
-* https://pub.dev/packages/rfw
+* https://pub.dev/packages/rfw
+* https://github.com/google/omaha
+* http://code.google.com/p/update-engine/
+* https://sparkle-project.org/
+
+Did we forget some?  Patches welcome!