Update __init__.py (#561)

Signed-off-by: xiaowuhu <[email protected]>

Update the version number to release a new version.

Author: xiaowuhu

onnxmltools/__init__.py

@@ -5,7 +5,7 @@
 This framework converts any machine learned model into onnx format
 which is a common language to describe any machine learned model.
 """
-__version__ = "1.11.0"
+__version__ = "1.11.1"
 __author__ = "ONNX"
 __producer__ = "OnnxMLTools"
 __producer_version__ = __version__