Fixed the rxjs operators import

Author: Luis Fernando Planella Gonzalez

templates/service.handlebars

@@ -7,8 +7,7 @@ import { {{configurationClass}} } from '../{{configurationFile}}';
 import { {{responseClass}} } from '../{{responseFile}}';
 import { {{requestBuilderClass}} } from '../{{requestBuilderFile}}';
 import { Observable } from 'rxjs';
-import { map } from 'rxjs/operators/map';
-import { filter } from 'rxjs/operators/filter';
+import { map, filter } from 'rxjs/operators';
 
 {{#imports}}import { {{{typeName}}}{{#useAlias}} as {{{qualifiedName}}}{{/useAlias}} } from '{{{file}}}';
 {{/imports}}