Update version in setup.py to 0.2.0 (#164)

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New release with features should bump minor version tehe
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setup.py

@@ -1,6 +1,6 @@
 from setuptools import find_namespace_packages, setup
 
-__version__ = "0.1.2"
+__version__ = "0.2.0"
 
 setup(
     name="liger_kernel",