Release 0.15.0

Added

• Added new options to fetch command:
  • --git-single-branch could be used to clone repos with single branch options
  • --git-depth-1 could be used to clone repos with option --depth=1
• Experimental support of Odoo 16.0

Fixes

• flake8-colors not needed anymore, as flake8 support color output byt default.
• Limit version of pylint-odoo to less then 8.0 for backward compatibility.
  This is done because OCA remove a large part of functionality in 8.0.
  See merge request: OCA/pylint-odoo#396