feat(package): upgrade to ng v2.3+ (#574)

src/file-upload/file-upload.module.ts

@@ -0,0 +1,13 @@
+import { CommonModule } from '@angular/common';
+import { NgModule } from '@angular/core';
+
+import { FileDropDirective } from './file-drop.directive';
+import { FileSelectDirective } from './file-select.directive';
+
+@NgModule({
+  imports: [CommonModule],
+  declarations: [FileDropDirective, FileSelectDirective],
+  exports: [FileDropDirective, FileSelectDirective]
+})
+export class FileUploadModule {
+}