update mirror

Author: tjhei

index.html

@@ -9,6 +9,7 @@ <h1>deal.II/ASPECT image</h1>
 <p>
   Download: <a href="https://www.ces.clemson.edu/dealii/dealvm_1.19.ova">dealvm_1.19.ova</a>
   mirror1: <a href="https://dealii.43-1.org/downloads/virtualbox-images/dealvm_1.19.ova">dealvm_1.19.ova</a>
+  mirror2: <a href="https://drive.google.com/file/d/1XIKm5VnuPZgWqOTyWYHng0YGj-ljapEL/view?usp=sharing">dealvm_1.19.ova</a>
   <br>
 size: 3.7GB
 Last update: June 8, 2020