fix(readme): update nebular package description (PatrickJS#302)

Author: nnixaa

README.md

@@ -461,7 +461,7 @@ Http is available as an injectable class, with methods to perform http requests.
 * [ng-bootstrap](https://ng-bootstrap.github.io) - Angular 4 directives for Bootstrap 4 by the ui-bootstrap team
 * [ng-snotify](https://github.com/artemsky/ng-snotify/) - Angular 4 Notification Center
 * [ngx-permissions](https://github.com/AlexKhymenko/ngx-permissions) - Permission and roles based access control for your angular(angular 2, angular 4,5+) applications(AOT, lazy modules compatible)
-* [nebular](https://github.com/akveo/nebular) - Full-featured framework based on Angular
+* [Nebular](https://github.com/akveo/nebular) - set of essential (Theme, UI Kit, Auth, Security) modules for complex Angular applications
 * [ng-select](https://github.com/ng-select/ng-select) Angular ng-select - All in One UI Select, Multiselect and Autocomplete
 * [ng-katex](https://github.com/garciparedes/ng-katex) Angular module to write beautiful math expressions with TeX syntax boosted by KaTeX library
 * [ng-fullcalendar](https://github.com/Jamaks/ng-fullcalendar) Jquery fullcalendar module for Angular