setup.py: Migrate from vcversioner to setuptools-scm

Related to T2105

requirements.txt

 # Add here external Python modules dependencies, one per line. Module names
 # should match https://pypi.python.org/pypi names. For the full spec or
 # dependency lines, see https://pip.readthedocs.org/en/1.1/requirements.html
-vcversioner
 sphinx
 sphinxcontrib-httpdomain
 sphinxcontrib-images

setup.py

@@ -36,11 +36,11 @@ setup(
     packages=find_packages(),
     scripts=[],
     install_requires=parse_requirements(),
-    setup_requires=["vcversioner"],
+    setup_requires=["setuptools-scm"],
+    use_scm_version=True,
     extras_require={
         "testing": parse_requirements("test"),
         "building": parse_requirements("swh"),
     },
-    vcversioner={},
     include_package_data=True,
 )