Merge pull request #11 from JadeHayes/patch-1

Update setup.py - require newer gitPython version

setup.py

@@ -63,7 +63,7 @@
     description='Python package to find the version of another package, '
                 'whether installed via pip, setuptools or git.',
     long_description=long_description,
-    install_requires=['GitPython>=2.1.0,<2.2.0'],
+    install_requires=['GitPython~=3.1'],
     keywords="version git pip pkg_resources setuptools",
     classifiers=classifiers
 )