Run tests in PRs and on newer Node versions

Author: pimterry

.github/workflows/ci.yml

@@ -1,13 +1,13 @@
 name: CI
-on: push
+on: [push, pull_request]
 jobs:
   build:
     name: Build & test
     runs-on: ubuntu-latest
 
     strategy:
       matrix:
-        node-version: [10.x, 12.x, v14.6.0, 14.x, '*']
+        node-version: [10.x, 12.x, v14.18.3, 14.x, 16.x, 18.x, '*']
 
     steps:
       - uses: actions/checkout@v2