favicon.ico in root directory will not be rewritten during update.

System version 0.277
modules:
Blogs 0.046
Comments 0.008
Cron 0.005
Feedback 0.001
HybridAuth 2.1.1-cs21
OAuth2 0.014
Plupload 1.5.7-cs2
Static_pages 0.026
plugins:
Admin_default_theme 0.002
TinyMCE 4.0.1-cs3