ci: Fixed release publish job (#161)

Author: frgfm

.github/workflows/release.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Get release tag
         id: release_tag
         run: |
-          echo ::set-output name=VERSION::${GITHUB_REF/refs\/tags\//}
+          echo ::set-output name=VERSION::${GITHUB_REF/refs\/tags\//:1}
       - name: Build and publish
         env:
           TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
@@ -70,7 +70,7 @@ jobs:
       - name: Get release tag
         id: release_tag
         run: |
-          echo ::set-output name=VERSION::${GITHUB_REF/refs\/tags\//}
+          echo ::set-output name=VERSION::${GITHUB_REF/refs\/tags\//:1}
       - name: Build and publish
         env:
           ANACONDA_API_TOKEN: ${{ secrets.ANACONDA_TOKEN }}