Add support for the NO_COLOR environment variable

[oleiade]

This Pull Request adds support for the NO_COLOR environment variable.

When set, the colorize configuration option will always be enforced to false. If unset the colorize configuration option will be handled as usual.

ref #7

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config.ts:29

• [nitpick] The variable name noColor is ambiguous. It should be renamed to isNoColor to indicate that it's a boolean flag.

const noColor = env.NO_COLOR !== undefined;