Removed reference to 'equ' support per #569 (#657)

Author: Balearica

examples/browser/demo.html

@@ -71,7 +71,6 @@
 <option value='meme'     > Internet Meme                </option>
 <option value='epo'     > Esperanto             </option>
 <option value='epo_alt' > Esperanto alternative </option>
-<option value='equ'     > Math                  </option>
 <option value='est'     > Estonian              </option>
 <option value='eus'     > Basque                </option>
 <option value='fin'     > Finnish               </option>