fix typo

Author: Jayin

index.html

@@ -82,7 +82,7 @@ <h1>Java学习助手</h1>
 
         <p class="lead">"你拉屎的时候一定要用Java学习助手!"</p>
         <a id="download" class="btn btn-large btn-success"
-           href="released/java/EManual_for_JavaV1.0.0.apk">Download
+           href="released/java/EManual_for_Java.apk">Download
             Now</a>
     </div>