Add man page to the npm artifact

[badeball]

Steps to reproduce the issue, if applicable. Include the actual command and output and/or stack trace.

$ npm install -g http-server

What did you expect to happen?

For the man page to be installed.

$ man http-server
No manual entry for http-server

Tell us about your environment

• exact http-server version: v0.12.2
• Node version: v13.8.0
• Platform: Arch Linux

Other information (related issues, suggestions for a fix, etc):

I guess you only need to add the directory to the files-array in package.json and then npm is supposed to handle the rest - is that be correct?

Other information (related issues, suggestions for a fix, etc):

[thornjad]

Yep that'll do it. Nice quick catch! Guess I'll do the ol' quick patch release.