Correctly exporting methods

demo/17-footnotes.ts

@@ -1,7 +1,7 @@
 // Footnotes
 // Import from 'docx' rather than '../build' if you install from npm
 import * as fs from "fs";
-import { Document, Packer, Paragraph, TextRun, FootnoteReferenceRun } from "../build";
+import { Document, FootnoteReferenceRun, Packer, Paragraph, TextRun } from "../build";
 
 const doc = new Document();
 
@@ -17,7 +17,9 @@ doc.addSection({
                 }),
             ],
         }),
-        new Paragraph("Hello World").referenceFootnote(3),
+        new Paragraph({
+            children: [new TextRun("Hello World"), new FootnoteReferenceRun(3)],
+        }),
     ],
 });