Remove obsolete dependencies

Author: edgarmueller

package-lock.json

@@ -6,8 +6,6 @@
     "@jsonforms/core": "^2.0.12-rc.2",
     "@jsonforms/material-renderers": "^2.0.12-rc.2",
     "@material-ui/core": "^3.5.1",
-    "@material-ui/icons": "^3.0.1",
-    "@material-ui/lab": "^3.0.0-alpha.23",
     "react": "^16.3.0",
     "react-dom": "^16.3.0",
     "redux": "^3.7.2"