Move release script to the .github folder

Author: curquiza

scripts/check-release.sh renamed to .github/scripts/check-release.sh

@@ -11,7 +11,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: Check release validity
-        run: sh scripts/check-release.sh
+        run: sh .github/scripts/check-release.sh
       - uses: actions/setup-node@v1
         with:
           node-version: 12