chore(deps): update dependency sockjs-client to v1.4.0 (#2217)

Author: renovate[bot]

package-lock.json

@@ -60,7 +60,7 @@
     "semver": "^6.3.0",
     "serve-index": "^1.9.1",
     "sockjs": "0.3.19",
-    "sockjs-client": "1.3.0",
+    "sockjs-client": "1.4.0",
     "spdy": "^4.0.1",
     "strip-ansi": "^3.0.1",
     "supports-color": "^6.1.0",