add node 17 to ci matrix

Author: isaacs

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [10.0.x, 10.x, 12.0.x, 12.x, 14.0.x, 14.x, 15.x, 16.0.x, 16.x]
+        node-version: [10.0.x, 10.x, 12.0.x, 12.x, 14.0.x, 14.x, 15.x, 16.0.x, 16.x, 17.x]
         os: [ubuntu-latest]
 
     steps: