Add an option for disabling colourful bacon output
Add an option for disabling colourful bacon output

If you don't want to see colours in your bacon output then export
`NO_PRY_COLORED_BACON` variable in your shell rc file and set it to
`true`.

Signed-off-by: Kyrylo Silin <6129bf6f04030cd1423e4f3df28402e79fbf30a4@gmail.com>

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