supports-color known bugs

Emacs `M-x shell` runs the shell in an environment where the `TERM` variable is set to `dumb`, which informs the shell and applications that the terminal does not support any terminal control escape sequences. While you have code to handle the [dumb](https://github.com/chalk/supports-color/blob/c94d6c51f60759f72a93d7c73c99e18dae995d73/index.js#L115) setting, both the Windows platform processing and the `TERM_PROGRAM` are processed first. For instance on macOS, ```bash $ cd /path/to/mocha/node_modules $ TERM=dumb node -e "var tty = require('./supports-color'); console.log(tty.stdout);" { level: 2, hasBasic: true, has256: true, has16m: false } $ TERM_PROGRAM= TERM=dumb node -e "var tty = require('./supports-color'); console.log(tty.stdout);" false ``` Mocha is getting publicly blamed for [this](https://emacs.stackexchange.com/questions/27218/why-is-there-so-often-ugly-output-in-node-js-compilation-buffers). Suggestions?

At the moment, the `supportsColor()` function does not consider all the environment variables fresh each time it's called. This means changing `process.env.FORCE_COLOR` at runtime has no effect on the `supportsColor()` result. This bug prevents us from being able to do `process.env.FORCE_COLOR = '1'`, run a snapshot test of something that uses `chalk`/`supports-color` for formatting, then revert the `FORCE_COLOR` back again. This issue probably blocks a fix for https://github.com/babel/babel/issues/12442 .

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