add contents PDF

index.html

@@ -78,6 +78,7 @@ Addison-Wesley; 380pp; ISBN:&nbsp;978-0134190440<br/>
 <div id='toc'>
 <table><tr>
 <td>
+<h1>Contents [<a href='contents.pdf'/>PDF</a>]</h1>
 <h1>Preface</h1>
 <h1>1. Tutorial</h1>
 <h1>2. Program Structure</h1>
@@ -85,10 +86,9 @@ Addison-Wesley; 380pp; ISBN:&nbsp;978-0134190440<br/>
 <h1>4. Composite Types</h1>
 <h1>5. Functions</h1>
 <h1>6. Methods</h1>
-<h1>7. Interfaces</h1>
 </td>
 <td>
-<h1>&nbsp;<!--blank--></h1>
+<h1>7. Interfaces</h1>
 <h1>8. Goroutines and Channels</h1>
 <h1>9. Concurrency with Shared Variables</h1>
 <h1>10. Packages and the Go Tool</h1>