Update configuration-languages.md

[lornally]

coffee-script has been move to coffeescript

describe your changes...

• Read and sign the CLA. PRs that haven't signed it won't be accepted.
• Make sure your PR complies with the writer's guide.
• Review the diff carefully as sometimes this can reveal issues.
• Do not abandon your Pull Request: Stale Pull Requests.
• Remove these instructions from your PR as they are for your eyes only.

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[chenxsan]

Buggy CLA bot.

[chenxsan]

@lornally Can you sign the CLA here https://cla.js.foundation/webpack/webpack.js.org?

[lornally]

i have sign cla. :)

[chenxsan]

@lornally Thank you for your contribution.