Fix GITHUB_REF in release workflow

Author: benfrancis

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
         with:
           node-version: 8
       - name: Set release version
-        run: echo "RELEASE_VERSION=${GITHUB_REF:11}" >> $GITHUB_ENV
+        run: echo "RELEASE_VERSION=${GITHUB_REF:10}" >> $GITHUB_ENV
       - name: Package project
         run: |
           ./package.sh