fix: add missing comma after newly added incremental-parameter

fix of previous change/commit regarding same topic

Author: dornech

commitizen/commands/changelog.py

@@ -245,7 +245,7 @@ def __call__(self) -> None:
             tree,
             self.cz.template_loader,
             self.template,
-            incremental=self.incremental
+            incremental=self.incremental,
             **{
                 **self.cz.template_extras,
                 **self.config.settings["extras"],