Update version to 0.2.0 for release (#52)

Author: markurtz

setup.py

@@ -18,7 +18,7 @@
 from setuptools import find_packages, setup
 
 _PACKAGE_NAME = "sparsezoo"
-_VERSION = "0.1.1"
+_VERSION = "0.2.0"
 _VERSION_MAJOR, _VERSION_MINOR, _VERSION_BUG = _VERSION.split(".")
 _VERSION_MAJOR_MINOR = f"{_VERSION_MAJOR}.{_VERSION_MINOR}"
 _NIGHTLY = "nightly" in sys.argv