Update to use new Coiled logo (#49)

Author: Kristopher Overholt

index.html

@@ -111,7 +111,7 @@
                 <span aria-hidden="true">&times;</span>
               </button>
             </div>
-            
+
             <!-- Three columns of text below the carousel -->
             <h2 class="featurette-heading">Integrates with existing projects</h2>
             <h2 class="featurette-subheading">Built with the broader community</h2>
@@ -546,7 +546,7 @@ <h2 id="supported-by"><a href="#supported-by" class="link-unstyled">Supported By
                   <a href="https://www.capitalone.com/"><img src="https://www.capitalone.co.uk/images/c1/brand/logo.svg"></a>
                 </div>
                 <div class="col supporter">
-                  <a href="https://coiled.io/"><img src="https://raw.githubusercontent.com/coiled/logos/master/horizontal.svg"></a>
+                  <a href="https://coiled.io/"><img src="https://raw.githubusercontent.com/coiled/logos/master/Coiled-Logo_Horizontal_Black-RGB.png"></a>
                 </div>
                 <div class="col supporter">
                   <a href="https://www.darpa.mil"><img src="https://upload.wikimedia.org/wikipedia/commons/thumb/6/6e/DARPA_Logo.jpg/320px-DARPA_Logo.jpg"></a>