* Unify battery meters look'n feel
Switch to proper (vertical) battery icons (one per 10% steps).
Fix#5535
* Bump fonts (https://github.com/koreader/koreader-fonts/pull/7)
Because we need the new symbols from nerdfonts ;).
so that we can easily find which module needs unit test
In order to run 'make coverage' `luacov` need to be installed
with 'sudo luarocks install luacov'.