Updated stylus dependencies to 0.54.8.

[AlynxZhou]

Fix #347, remove NodeJS 14 warnings.

[stevenjoezhang]

@xdan @iChenLei Is it possible to publish a new version of nib on npm that includes this commit? Thanks!

[iChenLei]

https://www.npmjs.com/package/nib

Only @tj and @notslang have the permission to publish nib package, @stevenjoezhang I am so sorry, I can't solve this problem immediately, I must send email to tj or slang first.

[stevenjoezhang]

Thanks very much for your reply. nib is an important dependency of the blog framework Hexo and is used by many blog themes. I would appreciate if the package can be updated on npm.

[notslang]

@iChenLei - I looked though the commit log and it seems like we're just updating deps and test cases. If there's no new functionality I'll release the last 31 commits as a patch. Do you think that's good, or should this be a new minor version?

[iChenLei]

@notslang #350 I create a pr for ci, replace outdated travis-ci with github actions, and make stylus as peerDependencies and not limit version, semver is wildcard *. please review. I think minor version is better v1.2.0, and please help me add this big change in changelog, this is important for nib user. thanks

https://github.com/iChenLei/nib/actions/runs/1211720732 New CI is work as expected.