fix: http -> httpClient

Author: stbui

src/app/crm/lead/lead.service.ts

@@ -1,5 +1,5 @@
 import { Injectable } from '@angular/core';
-import { Http } from '@angular/http';
+import { HttpClient } from '@angular/common/http';
 import { environment } from '../../../environments/environment';
 import 'rxjs/add/operator/toPromise';
 
@@ -8,11 +8,11 @@ export class LeadService {
 
   private apiUrl = environment.crmApi;
 
-  constructor(private _http: Http) {
+  constructor(private _http: HttpClient) {
   }
 
   getLead() {
     const url = `${this.apiUrl}/contacts.json`;
-    return this._http.get(url).toPromise().then(res => res.json());
+    return this._http.get(url).toPromise();
   }
 }