Results 3 issues of hirose31

Thank you for greate product! I want to use pep8speaks on my GitHub Enterprise. This PR enables that and fix some tweaks. Could you possibly review?

This pull request fixes raising `ArgumentError` exception when run on Ruby >= 3.0 due to [incompatible changes of keyword arguments](https://www.ruby-lang.org/en/news/2019/12/12/separation-of-positional-and-keyword-arguments-in-ruby-3-0/). I have confirmed that it works with the [td-agent package...

# Description In nginx with nchan enabled, setting the `client_body_temp_path` in nginx.conf to the default path results in a segmentation fault. # Environment I confirmed this issue in the following...