Include math.h for log() (fix for OSX)

README.md

@@ -85,15 +85,7 @@ To do this, search for the INCLUDES line and add the following to the end;
 
 Save the Makefile.
 
-<h4>Final Steps</h4>
-
-Open up TextEdit/TextWrangler/etc and open up the widget/filetransfertwidget.cpp file and add the following include;
-
-```bash
-#include <math.h>
-```
-
-This will stop toxgui failing to make under OSX.
+<h5>Final Steps</h5>
 
 The final step is to run 
 ```bash

widget/filetransfertwidget.cpp

@@ -1,6 +1,7 @@
 #include "filetransfertwidget.h"
 #include "widget.h"
 #include "core.h"
+#include "math.h"
 #include <QFileDialog>
 #include <QPixmap>