Update setup file for new release

Author: fmfn

setup.py

@@ -8,7 +8,7 @@
     author='Fernando Nogueira',
     author_email="[email protected]",
     description='Bayesian Optimization package',
-    download_url='https://github.com/fmfn/BayesianOptimization/tarball/0.4',
+    download_url='https://github.com/fmfn/BayesianOptimization/tarball/0.6',
     install_requires=[
         "numpy >= 1.9.0",
         "scipy >= 0.14.0",