Update version to 0.6.0

To be merged after #246.

Author: 95-martin-orion

setup.py

@@ -74,7 +74,7 @@ def build_extension(self, ext):
 # README file as long_description.
 long_description = open('README.md', encoding='utf-8').read()
 
-__version__ = '0.5.1'
+__version__ = '0.6.0'
 
 setup(
     name='qsimcirq',