chore: add Node.js 16 in the test matrix

See also: https://github.com/nodejs/Release

Author: darrachequesne

Diff for: .github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [12.x, 14.x]
+        node-version: [14, 16]
 
     steps:
       - uses: actions/checkout@v2

Diff for: package-lock.json

@@ -44,7 +44,7 @@
   },
   "devDependencies": {
     "babel-eslint": "^8.0.2",
-    "eiows": "^3.3.0",
+    "eiows": "^3.8.0",
     "engine.io-client": "6.1.0",
     "engine.io-client-v3": "npm:[email protected]",
     "expect.js": "^0.3.1",