fix(ci): fix syntax for node version

Author: codebender828

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: 12.x
+        node-version: 12
     steps:
     - name: Checkout Repo
       uses: actions/checkout@master