flake8 fixes replace bare except with except (ImportError, AttributeError)

Author: rouilj

roundup/anypy/http_.py

@@ -2,7 +2,7 @@
     # Python 3+
     from http import client, server
     server.DEFAULT_ERROR_MESSAGE
-except:
+except (ImportError, AttributeError):
     # Python 2.5-2.7
     import httplib as client
     import BaseHTTPServer as server