Please consider adding PyPy Trove classifiers, because apparently black works fine! At least on the recent PyPy (I tested PyPy3.6 v7.0 on macOS). I used version 18.9b0 of black. See https://pypy.org/download.html

Describe the bug

Nightly --file-lines feature description has creeped into the stable rustfmt --help. It is a minor thing but can be misleading. For example, the following description makes it seem like this is a valid option:

-h, --help [=TOPIC] Show this message or help about a specific topic:
                        `config` or `file-lines`

To Reproduce

rus

When I try to beautify the i get the following problem
TypeError: Cannot read property 'on' of undefined

I just installed beautify and uncrustify

https://gist.github.com/ODCA117/917affd6b11437517535a45350379820

We need to update our README.md file before the 1.0 release.