Fix didChangeConfiguration (#138)

Author: gatesn

pyls/python_ls.py

@@ -149,7 +149,7 @@ def m_text_document__signature_help(self, textDocument=None, position=None, **_k
         return self.signature_help(textDocument['uri'], position)
 
     def m_workspace__did_change_configuration(self, settings=None):
-        self.config.update((settings or {}).get('pyls'))
+        self.config.update((settings or {}).get('pyls', {}))
         for doc_uri in self.workspace.documents:
             self.lint(doc_uri)