title: ng-bootstrap not displaying tooltip
body: <p>I want to display a tooltip. I went to ng-bootstrap and integrated that code. Getting console error.</p>
  
  <pre><code>core.es5.js:1020 ERROR Error: Uncaught (in promise): Error: No provider for 
  NgbTooltipConfig!
  Error: No provider for NgbTooltipConfig!
  at injectionError (core.es5.js:1169)
  at noProviderError (core.es5.js:1207)
  at ReflectiveInjector_._throwOrNull (core.es5.js:2649)
  at ReflectiveInjector_._getByKeyDefault (core.es5.js:2688)
  at ReflectiveInjector_._getByKey (core.es5.js:2620)
  at ReflectiveInjector_.get (core.es5.js:2489)
  at resolveNgModuleDep (core.es5.js:9492)
  at NgModuleRef_.get (core.es5.js:10562)
  at resolveDep (core.es5.js:11050)
  at createClass (core.es5.js:10920)
  </code></pre>
  
  <p>Added these lines in app.module.ts</p>
  
  <pre><code>import {NgbModule} from '@ng-bootstrap/ng-bootstrap';
  
  @NgModule({
    imports: [    
      NgbModule
    ]
  })
  </code></pre>
  
  <p>Installed ng-bootstrap using command</p>
  
  <pre><code>npm install --save @ng-bootstrap/ng-bootstrap
  </code></pre>