More UI and internals tinkering

• The keywords display now allows for keywords that are space or comma separated. (#21)
• The download count is now no longer shown (it is always -1 anyway). (#23)
• Requirements are now de-duplicated and sorted. (#24)
• Made the UI a bit more minimal. (#26)
• Switched to using Packaging to parse
  dependency package details.

Reworking the UI

• Add support for passing a package name on the command line.
• Show the package details inline in the terminal if the package name was passed on the command line.
• Big reworking of the whole UI.

Tidy up and make available via Homebrew

• Reworked the way the metadata is shown (#2).
• Clicking on URLs in the display now opens the default web browser (#7).

v0.4.0 of PISpy

Updated to Textual v0.11.1, and started using the new Markdown widget to display markdown data.

v0.3.0 of PISPy

Updated to the latest version of Textual, and make changes to take Textual changes into account. Also pinned the version of Textual (for now).

v0.2.0 of PISpy

This release rounds out the data that is displayed when brought back from the JSON interface.

v0.1.0 of pispy

Initial release