chore: add tests for Node 16 (#410)

Author: MichaelDeBoey

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         eslint-version: [7.x, 6.x, 5.x]
-        node-version: [14.x, 12.x, 10.x, 8.x, 6.x]
+        node-version: [16.x, 14.x, 12.x, 10.x, 8.x, 6.x]
 
         exclude:
           # eslint 7 does not support node 6 or 8