Fix GitHub Action

Author: zachwhaley

.github/workflows/release.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - run: echo ::set-env name=RELEASE_VERSION::${GITHUB_REF#refs/*/}
+    - run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
 
     - name: Checkout code
       uses: actions/checkout@v2