switch an assert for a trace

Author: RonnyPfannschmidt

setuptools_scm/version.py

@@ -57,7 +57,8 @@ def __init__(self, tag_version,
                  distance=None, node=None, dirty=False,
                  preformatted=False,
                  **kw):
-        assert not kw, kw
+        if kw:
+            trace("unknown args", kw)
         self.tag = tag_version
         if dirty and distance is None:
             distance = 0