Down scroll direction works incorrect

[Igor-Palaguta]

https://github.com/Antondomashnev/ADTickerLabel/blob/master/ADTickerLabel.m#L125

Should be

if (![selectedCharacter isEqualToString:@"."]){
            selectedCharacterIndex--;
        }

[Igor-Palaguta]

Also pay attention that in your sample when we change it from 18741984 to 897. When direction is down we have "89."
in updateTickerCharacterViewsFrames you change frame, but you don't update selectedCharacterIndex
That is why it still think that third character is 7, but really it points to first character

[Igor-Palaguta]

These issues are also fixed here: https://github.com/Igor-Palaguta/ADTickerLabel