option for no colors

[Aeyk]

i don't want to install glow or anything to get a colorless output

please consider supporting NO_COLORS, or TERM=dumb/xterm-mono and/or test -t 0 for non terminal outputs. as it is stands piping to less or redirecting to a file fills it with color codes and makes it impossible to read.

it's a 3 line minimally tested patch and i will gladly provide it

thanks for the nice tool!

[Aeyk]

pull request #282