demo(getting-started): Updated CSS include code to reference SUI 2.2.13

Author: edcarroll

demo/src/app/pages/getting-started/getting-started.page.ts

@@ -14,7 +14,7 @@ export class GettingStartedPage {
     public installCode:string = `$ npm install ng2-semantic-ui --save`;
 
     public includeCssCode:string =
-`<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/semantic-ui/2.2.9/semantic.min.css">`;
+`<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/semantic-ui/2.2.13/semantic.min.css">`;
 
     public importCode:string = `import {SuiModule} from 'ng2-semantic-ui';`;
     public moduleImportCode:string = `