Update index.html

Drops 4.0rc version argument

Author: leandrotoledo

website/templates/website/index.html

@@ -86,7 +86,7 @@ <h2>It's fun</h2>
 </pre></div>
         <br />
         <h2>Easy to setup</h2>
-        <div class="highlight"><pre><span class="gi">$</span> pip install python-telegram-bot<span class="o">==</span>4.0rc1
+        <div class="highlight"><pre><span class="gi">$</span> pip install python-telegram-bot
 <span class="gi">$</span> python bot.py</pre></div>
         <br />
         <h2>And it is free</h2>