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>

dev-requirements.txt

@@ -3,6 +3,6 @@ pylint>=1.6,<2
 pytest>=3.0,<4
 coverage>=4.3,<5
 git+https://github.com/wheerd/sphinx-autodoc-typehints.git@napoleon-master#egg=sphinx-autodoc-napoleon-typehints
-setuptools_scm>=1.15,<2.0
+setuptools_scm>=1.15,<6.0
 tox>=2.5,<3.0
 pytest-cov>=2.5,<3.0