chore(deps): bump readable-stream and add node 18 to ci (#1520)

* chore(deps): bump readable-stream and add node 18 to ci

* fix: switch to terser

Author: robertsLando

.github/workflows/mqttjs-test.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [12.x, 14.x, 16.x]
+        node-version: [12.x, 14.x, 16.x, 18.x]
       fail-fast: false
 
     steps: