textproc/television: Update to 0.15.9
Use COPYTREE_SHARE to copy more markdown documentation files.
Changelogs:
https://github.com/alexpasmantier/television/releases/tag/0.15.9
https://github.com/alexpasmantier/television/releases/tag/0.15.8
https://github.com/alexpasmantier/television/releases/tag/0.15.7
https://github.com/alexpasmantier/television/releases/tag/0.15.6
https://github.com/alexpasmantier/television/releases/tag/0.15.5
https://github.com/alexpasmantier/television/releases/tag/0.15.4
https://github.com/alexpasmantier/television/releases/tag/0.15.3
https://github.com/alexpasmantier/television/releases/tag/0.15.2
https://github.com/alexpasmantier/television/releases/tag/0.15.1