Add range for con_scale

Author: NuclearMonster

README.md

@@ -261,7 +261,8 @@ the above locations, if desired.
   con_autoclear                     - Set to 0 to disable clearing console
                                       input text when console is closed
   con_scale                         - Scales console text to make it legible at
-                                      high resolutions
+                                      high resolutions. Defaults to 1. Maximum
+                                      is 4. Accepts fractional values (1.5).
   con_notifylines                   - The number of lines to display in the
                                       notify area