added bratislava hexagon

Author: yangwao

hexdex.html

@@ -110,6 +110,9 @@ <h1 data-i18n="hexdex-h1">Hexdex</h1>
           <a class="imglink" href="https://github.com/nodeschool/lisbon" title="Lisbon">
             <img class="hex" src="/images/nodeschool-lisbon.png" alt="Lisbon Hexagon">
           </a>
+          <a class="imglink" href="https://github.com/nodeschool/bratislava" title="Bratislava">
+            <img class="hex" src="/images/nodeschool-bratislava.svg" alt="Bratislava Hexagon">
+          </a>
           <a class="imglink" href="https://github.com/nodeschool/bainbridge" title="Bainbridge">
             <img class="hex" src="/images/nodeschool-bainbridge.svg" alt="Bainbridge Island Hexagon">
           </a>