Add node 16 and 18 to test matrix

Author: MasterOdin

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        node-version: [10.x, 12.x, 13.x, 14.x]
+        node-version: [10.x, 12.x, 13.x, 14.x, 16.x, 18.x]
 
     steps:
     - name: Cancel Previous Runs