Minor fixex to CHANGELOG and API-CHANGES related to 0.12.3.

API-CHANGES.txt

@@ -1,4 +1,4 @@
-0.12.3 (wip):
+0.12.3:
 
 * Package Import-Export renamed to Kernel-ImportExport
 * A dozen of methods moved from Object to ProtoObject

CHANGELOG

@@ -11,7 +11,7 @@ Highlights:
 * CodeMirror updated to ~3.20.0
 
 Commits: https://github.com/amber-smalltalk/amber/compare/0.12.2...0.12.3
-Issues:  https://github.com/amber-smalltalk/amber/issues?milestone=__&state=closed
+Issues:  https://github.com/amber-smalltalk/amber/issues?milestone=11&state=closed
 
 For the most important API related changes see the file API-CHANGES.txt.