Fix meta tags

Author: fab-jul

index.html

@@ -25,7 +25,7 @@
     <meta name="twitter:title" content="HiFiC - High-Fidelity Generative Image Compression">
     <meta name="twitter:description"
           content="We combine Generative Adversarial Networks with learned compression to obtain a state-of-the-art generative lossy compression system.">
-    <meta name="twitter:image" content="http://people.ee.ethz.ch/~mentzerf/_private_prototype/social/thumb.jpg">
+    <meta name="twitter:image" content="http://hific.github.io/social/thumb.jpg">
     <meta name="twitter:card" content="summary_large_image">
 
     <!-- Global site tag (gtag.js) - Google Analytics -->