don't test node 13

Author: ef4

.github/workflows/ci.yml

@@ -33,7 +33,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu, windows]
-        node-version: [12.x, 13.x, 14.x]
+        node-version: [12.x, 14.x]
 
     steps:
     - uses: actions/checkout@v1