update changelog

Author: myk002

changelog.txt

@@ -30,6 +30,14 @@ Template for new versions:
 
 ## New Features
 
+## Fixes
+
+## Misc Improvements
+
+## Removed
+
+# 51.11-r1
+
 ## Fixes
 - `list-agreements`: fix date math when determining petition age
 - `gui/petitions`: fix date math when determining petition age
@@ -40,8 +48,6 @@ Template for new versions:
 - `fix/loyaltycascade`: now also breaks up brawls and other intra-fort conflicts that *look* like loyalty cascades
 - `makeown`: remove selected unit from any current conflicts so they don't just start attacking other citizens when you make them a citizen of your fort
 
-## Removed
-
 # 51.09-r1
 
 ## New Features