Trim command output

hggithub.py

@@ -21,7 +21,7 @@ def cmd(description, *args, **kwargs):
         kwargs["stderr"] = STDOUT
         check_output(*args, **kwargs)
     except CalledProcessError as ex:
-        print(ex.output)
+        print(ex.output).strip()
         print("Command exited with code %d" % ex.returncode)
         raise