website: Fix twitter link

website/views/development.ejs

@@ -7,7 +7,7 @@
   <li><a href="/development/test">Test Suite</a></li>
   <li><a href="https://github.com/pegjs/pegjs/issues">Issue tracker</a></li>
   <li><a href="https://groups.google.com/group/pegjs">Google Group</a></li>
-  <li><a href="https://twitter.com/peg_js">Twitter</a></li>
+  <li><a href="https://twitter.com/pegjs">Twitter</a></li>
 </ul>
 
 <p>PEG.js is currently maintained by <a href="https://github.com/futagoza">Futago-za Ryuu</a>.

website/views/layout.ejs

@@ -43,7 +43,7 @@
         •
         <a href="https://github.com/pegjs/pegjs">Source code</a>
         &bull;
-        <a href="https://twitter.com/peg_js" title="Follow PEG.js on Twitter">Twitter</a>
+        <a href="https://twitter.com/pegjs" title="Follow PEG.js on Twitter">Twitter</a>
         <br />
         Copyright &copy; 2010&ndash;2016 <a href="https://majda.cz/">David Majda</a>
       </footer>