bump version for --icdiff-cols cli args et al

Author: hjwp

setup.py

@@ -13,7 +13,7 @@ def read(fname):
 
 setup(
     name="pytest-icdiff",
-    version="0.8",
+    version="0.9",
     author="Harry Percival",
     author_email="[email protected]",
     maintainer="Harry Percival",