Fix pypi description

Signed-off-by: Atanas Dimitrov <[email protected]>

Author: Atanas Dimitrov

setup.py

@@ -327,7 +327,7 @@ def run(self):
 setuptools.setup(
     name="onnxoptimizer",
     version=VersionInfo.version,
-    description="Open Neural Network Exchange",
+    description="Actively maintained ONNX Optimizer",
     ext_modules=ext_modules,
     cmdclass=cmdclass,
     packages=packages,