update dep list

README

@@ -16,6 +16,7 @@
 <ul>
 <li>python3.4 or higher</li>
 <li>python3-gi</li>
+<li>python3-gi-cairo</li>
 <li>gir1.2-gtk-3.0</li>
 <li>python-nbxmpp</li>
 </ul>
@@ -43,6 +44,8 @@
 <h2>Compile-time Requirements</h2>
 <ul>
 <li>intltool (>= 0.40.1)</li>
+<li>pkg-config</li>
+<li>libtool</li>
 </ul>
 
 <p><strong>NOTE:</strong> If you still have problems compiling, you may want to try removing the gtk1 series of the above dependencies.</p>