README: Update project README

"configure your appreciated configuration" doesn't make English sense to
me.  I think it is trying to say "choose your preferred configuration"

Signed-off-by: Kevin Darbyshire-Bryant <kevin@darbyshire-bryant.me.uk>

README

 This is the buildsystem for the LEDE Linux distribution.
 
-Please use "make menuconfig" to configure your appreciated
+Please use "make menuconfig" to choose your preferred
 configuration for the toolchain and firmware.
 
 You need to have installed gcc, binutils, bzip2, flex, python, perl, make,