Fix flake8 warnings

mpcdf_common.py

@@ -59,7 +59,7 @@ def check_for_update():
         setattr(sys.modules["mpcdf_common"], "checked_for_updates", 1)
 
     if (sys.version_info > (3, 0)):
-        set_encoding = {"encoding" : "utf-8"}
+        set_encoding = {"encoding": "utf-8"}
     else:
         set_encoding = {}