fix: stop testing in Node 8, test in Node 13

Author: gr2m

lib/create-test-action.js

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node_version: ['8', '10', '12']
+        node_version: ["10", "12", "13"]
 
     steps:
       - uses: actions/checkout@v2