Update 2020vrst_muto.html

fix url

Author: TakashiIjiri

projects/2020vrst_muto.html

@@ -63,7 +63,7 @@ <h4>Shibaura Institute of Technology</h4>
 
       <div class="contents_whitebg_text_600">
         <h2>Materials</h2>
-        [<a href="../papers/VRST2020_Muto.pdf">preprint</a>]
+        [<a href="../papers/2020_VRST_Muto.pdf">preprint</a>]
         [<a href="https://dl.acm.org/doi/10.1145/3385956.3422086"> VRST 2020 poster </a>]
         <br>
         <pre>