Update readme with timings for char-rnn
Update readme with timings for char-rnn

brunoro/clnn,hughperkins/clnn,szagoruyko/clnn,brunoro/clnn,szagoruyko/clnn,hughperkins/clnn,hughperkins/clnn,szagoruyko/clnn,hughperkins/clnn,brunoro/clnn,brunoro/clnn,szagoruyko/clnn