Print information about written files

We already output some messages, but not the most important part: what
files were written.

rust2rpm/__main__.py

@@ -515,10 +515,11 @@ def main():
         with open(spec_file, "w") as fobj:
             fobj.write(spec_contents)
             fobj.write("\n")
+        print(f'Wrote {fobj.name}')
         if patch_file is not None:
             with open(patch_file, "w") as fobj:
                 fobj.writelines(diff)
-
+            print(f'Wrote {fobj.name}')
 
 if __name__ == "__main__":
     main()