fix: Added icon

Author: qvistgaard

action.yaml

@@ -1,5 +1,6 @@
 name: 'Generate changelog with git-chglog'
 description: 'Greet someone and record the time'
+icon: calendar
 inputs:
   next_version:
     description: 'Next version'
@@ -21,4 +22,4 @@ runs:
   args:
     - ${{ inputs.config_dir }}
     - ${{ inputs.next_version }}
-    - ${{ inputs.filename }}
+    - ${{ inputs.filename }}