Compatibility with Blender 2.93 / Python 3.9 → require Blender 2.80+

The code now requires Python 3.7 or newer, as a side-effect of the changes
required for compatibility with 3.9 (as used in Blender 2.93). As a result,
Blender Cloud Add-on now requires Blender 2.80 or newer.

blender_cloud/__init__.py

@@ -25,7 +25,7 @@ bl_info = {
     'blender': (2, 80, 0),
     'location': 'Addon Preferences panel, and Ctrl+Shift+Alt+A anywhere for texture browser',
     'description': 'Texture library browser and Blender Sync. Requires the Blender ID addon '
-                   'and Blender 2.77a or newer.',
+                   'and Blender 2.80 or newer.',
     'wiki_url': 'https://wiki.blender.org/index.php/Extensions:2.6/Py/'
                 'Scripts/System/BlenderCloud',
     'category': 'System',