Update setuptools-scm requirement from <2.0,>=1.15 to >=1.15,<6.0

Updates the requirements on [setuptools-scm](https://github.com/pypa/setuptools_scm) to permit the latest version.
- [Release notes](https://github.com/pypa/setuptools_scm/releases)
- [Changelog](https://github.com/pypa/setuptools_scm/blob/master/CHANGELOG.rst)
- [Commits](pypa/setuptools_scm@1.15.0...v5.0.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

setup.py

@@ -32,7 +32,7 @@
         'Programming Language :: Python :: 3.6',
     ],
     setup_requires=[
-        'setuptools_scm>=1.15,<2.0'
+        'setuptools_scm>=1.15,<6.0'
     ],
     extras_require={
         'docs': [