adjusting test pypi publish (#176)

Author: michaelraczycki

.github/workflows/pypi.yml

@@ -69,7 +69,7 @@ jobs:
           python -m venv venv-test-pypi
           venv-test-pypi/bin/python -m pip install --index-url https://test.pypi.org/simple/ --extra-index-url https://pypi.org/simple pymc-experimental
           echo "Checking import and version number"
-          venv-test-pypi/bin/python -c "import pymc_experimental; assert pymc_experimental.__version__ == '${{  github.ref_name }}'"
+          venv-test-pypi/bin/python -c "import pymc_experimental; assert pymc_experimental.__version__ == '${{ github.ref_name }}'[1:]"
 
   publish:
     name: upload release to PyPI