Update CHANGELOG.md to v3.6.3

Author: JosepSampe

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-## [v3.6.3.dev0]
+## [v3.6.4.dev0]
 
 ### Added
 -
@@ -11,6 +11,12 @@
 ### Fixed
 - 
 
+## [v3.6.3]
+
+### Fixed
+- Fixed memory available options for aws batch: 4 cpus 
+- Fixed race condition and improving monitor stability 
+
 
 ## [v3.6.2]