Run on node 14 and 16

Author: cibernox

Diff for: .github/workflows/main.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [12.x, 14.x, 15.x]
+        node-version: [14.x, 16.x]
 
     steps:
       - uses: actions/checkout@v2