updates to bump sshpk

Author: ArayB

package.json

@@ -87,7 +87,7 @@
     "html-webpack-plugin": "^2.28.0",
     "http-proxy-middleware": "^0.17.3",
     "inject-loader": "^3.0.0",
-    "json-server": "^0.10.1",
+    "json-server": "^0.15.1",
     "karma": "^4.1.0",
     "karma-chrome-launcher": "^2.1.1",
     "karma-coverage": "^2.0.1",