Drop support for < node 12

Author: mheap

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [8.x, 10.x, 12.x, 14.x]
+        node-version: [12.x, 14.x, 16.x]
 
     env:
       CI: true