Update dependency ws to v8.20.0 (#113)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -32,7 +32,7 @@
     "open": "10.2.0",
     "serve-static": "1.16.3",
     "supervisor": "0.12.0",
-    "ws": "8.19.0"
+    "ws": "8.20.0"
   },
   "devDependencies": {
     "codecov": "3.8.3",