update tslint -> eslint

src/app/modules/songs/services/upload.ts

@@ -1,13 +1,12 @@
 export class Upload {
+  public $key: string;
+  public file: File;
+  public name: string;
+  public path: string;
+  public progress: number;
+  public createdAt: Date = new Date();
 
-  $key: string;
-  file: Upload;
-  name: string;
-  path: string;
-  progress: number;
-  createdAt: Date = new Date();
-
-  constructor(file: Upload) {
+  public constructor(file: File) {
     this.file = file;
   }
 }