Update index.html for Python 3 support

Author: cjmayo

docs/index.html

@@ -9,7 +9,7 @@
 
 <div align=right class=lastmod>
 <!-- hhmts start -->
-Last Modified: Mon Sep 26 09:04:15 UTC 2016
+Last Modified: Thu Oct 24 18:45:00 UTC 2019
 <!-- hhmts end -->
 </div>
 
@@ -58,7 +58,7 @@ <h2><a name="intro">What's It?</a></h2>
 <p>
 <h3>Features</h3>
 <ul>
-<li> Written entirely in Python. (for version 2.6 or newer)
+<li> Written entirely in Python. (for version 3.6 or newer)
 <li> Parse, analyze, and convert PDF documents.
 <li> PDF-1.7 specification support. (well, almost)
 <li> CJK languages and vertical writing scripts support.