Remove unused code and improve coverage

src/file/paragraph/links/bookmark.ts

@@ -4,10 +4,6 @@ import * as shortid from "shortid";
 import { TextRun } from "../run";
 import { BookmarkEndAttributes, BookmarkStartAttributes } from "./bookmark-attributes";
 
-export class BookmarkRef {
-    constructor(public readonly name: string, public readonly text: string) {}
-}
-
 export class Bookmark {
     public readonly start: BookmarkStart;
     public readonly text: TextRun;

src/file/paragraph/links/hyperlink.spec.ts

@@ -3,6 +3,7 @@ import { expect } from "chai";
 import { Formatter } from "export/formatter";
 
 import { Hyperlink } from "./";
+import { HyperlinkRef } from "./hyperlink";
 
 describe("Hyperlink", () => {
     let hyperlink: Hyperlink;
@@ -59,3 +60,11 @@ describe("Hyperlink", () => {
         });
     });
 });
+
+describe("HyperlinkRef", () => {
+    describe("#constructor()", () => {
+        const hyperlinkRef = new HyperlinkRef("test-id");
+
+        expect(hyperlinkRef.id).to.equal("test-id");
+    });
+});