[housekeeping] Remove prettyjson dependency
"lodash": "4.17.20",
"material-icons": "^0.5.3",
"ng-file-upload": "9.0.13",
- "ng-prettyjson": "0.1.8",
"ng-simple-slideshow": "1.2.9",
"ng2-dragula": "1.5.0",
"ngx-color-picker": "^11.0.0",
