Add ignored warnings

Author: ConorMacBride

setup.cfg

@@ -47,6 +47,8 @@ markers =
     hash: run test during hash comparison only mode.
 filterwarnings =
     error
+    ignore:distutils Version classes are deprecated
+    ignore:the imp module is deprecated in favour of importlib
 
 [flake8]
 max-line-length = 100