www/hackernews-tui: update to 0.6.0

v0.6.0
======
Another major release version after v0.5.0 with a lot of breaking changes.

Application changes:
  - Introducing Article View used to read a web page in reader mode directly in
  the application:
    - mercury-parser is required for the view to function
    - a brief demo video about Article View:
    https://www.youtube.com/watch?v=jIsKZwPi2T8
  - Supporting fully customizable key bindings:
    - users can now freely customize shortcuts by modifying the default config
    file
  - Change default key bindings:
    - With fully customizable shortcuts, the default key mapping received major
    changes to simplify its interfaces.
  - For more details on the new shortcuts, press ? in each View to see the
    new key mapping or read the default config file.
  - Remove webbroswer package (originally used to open a link in browser with
  cross-platform support)
    - Now, to open an external link in the browser, users need to define
    the url_open_command config option in the default config file.
    Default to be xdg-open.

Codebase changes:
  - implement new features (fully customizable key mapping, Article View)
  - fix bugs, improve documentation and error handlers

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