README: line-wrap
README: line-wrap

Make readme text easier to read/edit

Signed-off-by: Maciej Borzecki <f609d9f713abcd5f8f0e51f08dc151638a7681e7@open-rnd.pl>

ThomasRyd/mender,bboozzoo/mender,bboozzoo/mender,ThomasRyd/mender