README.md: add pkg-config install for Ubuntu.

ohwgiles / laminar

Fast and lightweight Continuous Integration

https://laminar.ohwg.net

GNU General Public License v3.0

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Closed Michael-S closed 8 months ago

ohwgiles commented 8 months ago

pkg-config is a relatively new build dependency, and Debian also needs it. If you just add it to the previous list I'll merge that

Michael-S commented 8 months ago

Thank you! Done.