Upload to TestPypi using a pep440 compatible version

Otherwise it fail with "'6.0.1.dev8+g5d1f746' is an invalid value for Version"

Author: philpep

setup.py

@@ -13,5 +13,21 @@
 
 import setuptools
 
+
+def local_scheme(version):
+    """Generate a PEP440 compatible version if PEP440_VERSION is enabled"""
+    import os
+    import setuptools_scm.version  # only present during setup time
+
+    return (
+        ''
+        if 'PEP440_VERSION' in os.environ
+        else setuptools_scm.version.get_local_node_and_date(version)
+    )
+
+
 if __name__ == '__main__':
-    setuptools.setup(use_scm_version=True, setup_requires=["setuptools_scm"])
+    setuptools.setup(
+        use_scm_version={'local_scheme': local_scheme},
+        setup_requires=["setuptools_scm"],
+    )

tox.ini

@@ -26,6 +26,8 @@ commands=sphinx-build -W -b html doc/source doc/build
 [testenv:packaging]
 description = Validate project packaging
 skip_install = true
+setenv =
+  PEP440_VERSION=true
 deps=
   check-manifest
 commands=