bump to 0.2.4

after reverting the track of @yosefm all the tests pass and we can release and build new wheels for 0.2.4

py_bind/setup.py

@@ -150,7 +150,7 @@ def mk_ext(name, files):
     package_data={
         'optv': ['*.pxd', '*.c', '*.h'],
     },
-    version='0.2.3',
+    version='0.2.4',
     install_requires=[
         'numpy==1.16.1',
         'pyyaml',