Fix help link (fixes #165) (#167)

Author: hdgarrood

client/public/index.html

@@ -63,7 +63,7 @@
           <input id="showjs" name="showjs" title="Show resulting JavaScript code instead of output" value="showjs" type="checkbox">
           <label id="showjs_label" for="showjs" title="Show resulting JavaScript code instead of output">Show JS</label>
         </li><li class="menu-item">
-          <a id="helplink" href="https://github.com/purescript/trypurescript/README.md" target="trypurs_readme">
+          <a id="helplink" href="https://github.com/purescript/trypurescript/blob/master/README.md" target="trypurs_readme">
             <label id="help" title="Learn more about Try PureScript">Help</label>
           </a>
         </li>