version bump -> 0.3.0 (#176)

setup.py

@@ -8,7 +8,7 @@
 We have developed the package with extensibility in mind. This library is still in development. We encourage the
 contribution of your datasets, metrics, explainers, and debiasing algorithms."""
 
-version = '0.3.0rc0'
+version = '0.3.0'
 
 with open("aif360/version.py", 'w') as f:
     f.write('# generated by setup.py\nversion = "{}"\n'.format(version))