build: add Node.js v16.x to CI (#983)

Author: legendecas

.github/workflows/ci-win.yml

@@ -7,7 +7,7 @@ jobs:
     timeout-minutes: 30
     strategy:
       matrix:
-        node-version:  [10.x, 12.x, 14.x, 15.x]
+        node-version:  [10.x, 12.x, 14.x, 15.x, 16.x]
         os:
           - windows-latest
           - windows-2016

.github/workflows/ci.yml

@@ -12,6 +12,7 @@ jobs:
           - node/12
           - node/14
           - node/15
+          - node/16
         compiler:
           - gcc
           - clang