Update release notes for the release (#101)

Author: llucax

RELEASE_NOTES.md

@@ -2,17 +2,4 @@
 
 ## Summary
 
-<!-- Here goes a general summary of what this release is about -->
-
-## Upgrading
-
-* The method `Dispatch.running(type: str)` was replaced with the property `Dispatch.started: bool`.
-* The SDK dependency was widened to allow versions up to (excluding) v1.0.0-rc1500
-
-## New Features
-
-<!-- Here goes the main new features and examples or instructions on how to use them -->
-
-## Bug Fixes
-
-* Fixed a crash when reading a Dispatch with frequency YEARLY.
+* The SDK dependency was widened to allow versions up to (excluding) v1.0.0-rc1600