gwu logo swap - fixes #511

Author: danbjoseph

app/_includes/members.html

@@ -34,7 +34,7 @@
             <img src="{{ site.baseurl }}/assets/graphics/content/logos/HeiGIT_logo.png" alt="HeiGIT logo" class="member" />
           </a>
           <a href="https://programs.gwu.edu/graduate/geographical-information-systems">
-            <img src="{{ site.baseurl }}/assets/graphics/content/logos/gwu_logo.svg" alt="george washington-logo" class="member" />
+            <img src="{{ site.baseurl }}/assets/graphics/content/logos/gwu_geo.png" alt="george washington-logo" class="member" />
           </a>
           <a href="http://cadasta.org">
             <img src="{{ site.baseurl }}/assets/graphics/content/logos/cadasta_logo.png" alt="cadasta logo" class="member" />