added node 18 to matrix

Author: ml054

.github/workflows/RavenClient.yml

@@ -24,7 +24,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [12.x, 14.x, 16.x]
+        node-version: [12.x, 14.x, 16.x, 18.x]
         serverVersion: ["5.2", "5.3"]
       fail-fast: false
 
@@ -71,4 +71,4 @@ jobs:
       run: node -e "require('./dist').DocumentStore"
 
     - name: Check imports
-      run: npm run check-imports
+      run: npm run check-imports