Add NodeJS 16 build matrix (#292)

Author: hardillb

.github/workflows/main.yml

@@ -21,7 +21,7 @@ jobs:
 
     strategy:
       matrix:
-        node: [12, 14]
+        node: [12, 14, 16]
         suffix: ["", "-minimal"]
 
     # Steps represent a sequence of tasks that will be executed as part of the job