ufoLib: remove __version__

we are no longer using setuptools_scm here... :,(
diff --git a/Lib/fontTools/ufoLib/__init__.py b/Lib/fontTools/ufoLib/__init__.py
index 2fb546c..d515da2 100644
--- a/Lib/fontTools/ufoLib/__init__.py
+++ b/Lib/fontTools/ufoLib/__init__.py
@@ -7,10 +7,5 @@
 from fontTools.ufoLib.reader import UFOReader
 from fontTools.ufoLib.writer import UFOWriter
 
-try:
-    from ._version import version as __version__
-except ImportError:
-    __version__ = "0.0.0+unknown"
-
 
 __all__ = ["Font", "UFOReader", "UFOWriter"]