subrepo: fix typo in help text

mercurial/subrepo.py

@@ -312,7 +312,7 b' class svnsubrepo(object):'
 
     def remove(self):
         if self.dirty():
-            self._repo.ui.warn(_('not removing repo %s because'
+            self._repo.ui.warn(_('not removing repo %s because '
                                  'it has changes.\n' % self._path))
             return
         self._repo.ui.note('removing subrepo %s\n' % self._path)