Fix one read receipt randomly not appearing

The velociraptor was only actioning hidden -> visible transitions
if the position had changed, so the one RR that stayed in position
but became visible... didn't become visible.

Author: dbkr

src/Velociraptor.js

@@ -62,11 +62,11 @@ module.exports = React.createClass({
                             oldNode.style.visibility = c.props.style.visibility;
                         }
                     });
-                    if (oldNode.style.visibility == 'hidden' && c.props.style.visibility == 'visible') {
-                        oldNode.style.visibility = c.props.style.visibility;
-                    }
                     //console.log("translation: "+oldNode.style.left+" -> "+c.props.style.left);
                 }
+                if (oldNode.style.visibility == 'hidden' && c.props.style.visibility == 'visible') {
+                    oldNode.style.visibility = c.props.style.visibility;
+                }
                 self.children[c.key] = old;
             } else {
                 // new element. If we have a startStyle, use that as the style and go through