Merge branch 'development' into patch-3

Author: lexasq

README.md

@@ -106,7 +106,7 @@ import { TooltipModule } from 'ngx-bootstrap/tooltip';
 
 @NgModule({
   ...
-  imports: [TooltipModule.forRoot(),...]
+  imports: [TooltipModule,...]
   ...
 })
 ```

apps/ngx-bootstrap-docs/src/app/app.module.ts

@@ -16,7 +16,7 @@ import { routes } from './app.routing';
     bootstrap: [AppComponent], imports: [BrowserAnimationsModule,
         DocsModule,
         RouterModule.forRoot(routes, { useHash: environment.useHash }),
-        BsDropdownModule.forRoot()], providers: [
+        BsDropdownModule], providers: [
         { provide: NgApiDoc, useValue: ngdoc },
         { provide: DOCS_TOKENS, useValue: routes },
         { provide: SIDEBAR_ROUTES, useValue: SidebarRoutesStructure },