media format

_layouts/person.html

@@ -98,7 +98,7 @@ layout: default
                 {% if page.researchgate %}
                 <a target="_blank"
 		   href="https://www.researchgate.net/profile/{{page.researchgate}}">
-		  <img style="width:50px;height:50px" src="/public/researchgate.png" title="ResearchGate"/>
+		  <img style="width:50px;height:50px" src="/public/researchgate.jpg" title="ResearchGate"/>
 		</a>
                 {% endif %}
                 {% if page.github %}