• Upgrade Python 3.10 definition to 3.10.1.
• Upgrade Python 3.9 definition to 3.9.9.

• Fix pythonup list to put 3.10 after 3.9.
• Upgrade Bleach to 3.3.0.
• Add Python 3.10 definition (3.10.0).
• Upgrade Python 3.9 definition to 3.9.8.
• Upgrade Python 3.8 definition to 3.8.10.

• Add Python 3.9 definition (3.9.0).
• Upgrade Python 3.8 definition to 3.8.6.
• Upgrade Python 3.7 definition to 3.7.9.
• Upgrade Bleach to 3.1.4.
• The bundled Python is upgraded to 3.6.8.

• Upgrade Bleach to 3.1.1.
• Upgrade Python 3.8 definition to 3.8.2.
• Upgrade Python 3.7 definition to 3.7.7.

Fix attrs compatibility.

Behavioural Changes

• Add Python 3.8 definition (3.8.0).
• Upgrade Python 3.7 definition to 3.7.5.

Behavioural Changes

• Upgrade Python 3.7 definition to 3.7.3.

Behavioural Changes

• Upgrade Python 3.6 definition to 3.6.8.

UI Changes

• pip shims no longer displays "Not using any versions".
• Fix a tense difference in command help messages.

Behavioural Changes

• Upgrade Python 3.6 definition to 3.6.7.
• Upgrade Python 3.7 definition to 3.7.1.

Installer Changes

• The bundled Python (used to run PythonUp) is upgraded to 3.6.7.

Fix pythonup upgrade self. The repository moved.