Add setuptools_scm

setup.py

 from setuptools import setup, find_packages
 
 setup(name='gym-stirap',
-      version='0.0.2',
       install_requires=['gym', 'scipy', 'matplotlib'], # And any other dependencies foo needs
+      use_scm_version=True,
+      setup_requires=['setuptools_scm'],
       packages=[package for package in find_packages()
                 if package.startswith('gym')]
 )
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