fixed the weird error.

Author: wenbingl

.azure-pipelines/win32-CI-nightly.yml

@@ -39,8 +39,8 @@ jobs:
       pip install %COREML_PATH% %ONNX_PATH%
       python -m pip install tensorflow-cpu==1.15.0
       python -m pip install tf2onnx==1.5.6
-      python -m pip install git+https://github.com/microsoft/onnxconverter-common@@r1.7
-      python -m pip install git+https://github.com/onnx/keras-onnx@@r1.7
+      python -m pip install git+https://github.com/microsoft/[email protected]
+      python -m pip install git+https://github.com/onnx/[email protected]
       echo Test onnxconverter-common installation... && python -c "import onnxconverter_common"
       pip install -r requirements.txt
       pip install -r requirements-dev.txt