Update setup.py/README.rst to match pyproject.toml/README.md (from build #462) [ci skip]

Author: CircleCI workflow

setup.py

@@ -24,7 +24,7 @@
 setup(
     long_description=readme,
     name='qctrl-open-controls',
-    version='3.0.0',
+    version='2.0.6',
     description='Q-CTRL Open Controls',
     python_requires='<3.8,>=3.6.4',
     project_urls={'repository': 'https://github.com/qctrl/python-open-controls'},