Fix for immutable HttpParams in build url search params

[kmiskiewicz]

Hi Asad

I've added a small fix for buildUrlSearchParams.

Currently HttpParams is immutable so you should set params as below: // for set method let params: HttpParams = new HttpParams().set('something', 'hello'); // for append method let params: HttpParams = new HttpParams().append('something', 'hello');

Here is the topic on stackoverflow https://stackoverflow.com/questions/45500264/angular-4-3-httpclient-get-params-empty

Best regards, Krzysztof

[asadsahi]

Thanks @kmiskiewicz