Update 2020vrst_egawa.html

fix url

Author: TakashiIjiri

projects/2020vrst_egawa.html

@@ -69,7 +69,7 @@ <h4>Raku Egawa, Yucheng Qiu, Takashi Ijiri <br> Shibaura Institute of Technology
 
     <div class="contents_whitebg_text_600">
       <h2>Materials</h2>
-      [<a href="../papers/VRST2020_Egawa.pdf">preprint</a>]
+      [<a href="../papers/2020_VRST_Egawa.pdf">preprint</a>]
       [<a href="https://dl.acm.org/doi/10.1145/3385956.3422102"> ACM DL </a>] <br>
     <pre>
     @inproceedings{10.1145/3385956.3422102,