update pickling version, because we have changed some things about the KeywordStatement a while ago
update pickling version, because we have changed some things about the KeywordStatement a while ago

tjwei/jedi,jonashaag/jedi,mfussenegger/jedi,flurischt/jedi,dwillmer/jedi,jonashaag/jedi,flurischt/jedi,mfussenegger/jedi,WoLpH/jedi,WoLpH/jedi,dwillmer/jedi,tjwei/jedi