ci: test against Node.js v18

see: loopbackio/cicd#27
Signed-off-by: Rifa Achrinza <[email protected]>

Author: achrinza

.github/workflows/continuous-integration.yaml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [10, 12, 14]
+        node-version: [10, 12, 14, 16, 17, 18]
         mongodb-version: [4.4] # the latest stable version
 
     steps: