Fix release workflow

Author: mattt

.github/workflows/release.yml

@@ -14,11 +14,14 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+      - name: Get the version
+        id: get_version
+        run: echo ::set-output name=VERSION::${GITHUB_REF#refs/tags/}
       - name: Get Changelog Entries
         id: changelog
         uses: mindsers/changelog-reader-action@v2
         with:
-          version: ${{ github.ref }}
+          version: ${{ steps.get_version.outputs.VERSION }}
           path: ./Changelog.md
       - name: Create Release
         uses: actions/create-release@v1