For --dry-run at least print a summary

Using -v is overkill for a script.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

Author: stsquad

git-publish

@@ -952,6 +952,11 @@ branch.%s.pushRemote is set appropriately?  (Override with --no-check-url)''' %
             print(e)
             return 1
         finally:
+            if options.dry_run:
+                npatches = len(selected_patches)
+                npeople = len(to) + len(cc)
+                print(f"Would have sent of {npatches} pactches to {npeople} people")
+
             if tmpdir:
                 shutil.rmtree(tmpdir)