Updated Custom Commands Compendium (markdown)

Custom-Commands-Compendium.md

@@ -85,6 +85,17 @@ customCommands:
     description: "prune deleted remote branches"
 ```
 
+## Pruning merged local branches
+
+```yml
+customCommands:
+  - key: "b"
+    command: "git branch --merged master | grep -v '^[ *]*master$' | xargs git branch -d"
+    context: "localBranches"
+    loadingText: "Pruning..."
+    description: "prune local branches that have been merged to master"
+```
+
 ## committing via Commitizen (git cz)
 
 ```yml