State that we did this, rather than leaving the user hanging

Often there won't be any other output, so this is confusing as it
looks like we stalled while creating the milestone.

Author: PeterJCLaw

scripts/import_backends.py

@@ -202,8 +202,8 @@ def get_or_create_milestone(self, title: str) -> github.Milestone:
         try:
             return self.milestones[title]
         except KeyError:
-            print(f"Creating Milestone {title}")
             milestone = self.repo.create_milestone(title)
+            print(f"Created Milestone {title}")
             self.milestones[title] = milestone
             return milestone