build: support Node.js 16.x

Author: dougwilson

.github/workflows/ci.yml

@@ -29,6 +29,7 @@ jobs:
         - Node.js 13.x
         - Node.js 14.x
         - Node.js 15.x
+        - Node.js 16.x
 
         include:
         - name: Node.js 0.6
@@ -88,6 +89,9 @@ jobs:
         - name: Node.js 15.x
           node-version: "15.14"
 
+        - name: Node.js 16.x
+          node-version: "16.13"
+
     steps:
     - uses: actions/checkout@v2