Montserrat does not exist in stylesheet

[umitseyhan75]

Lato used insted. In both readme.md and codepen live demo its written that Montserrat is used as sans-serif.
Please provide information about this change.

[sthanyulahsema]

I've opened a pull request (#5) to update the README to reflect that Lato is the actual UI font used in the CSS. This resolves the inconsistency between documentation and code. Please review when you have a moment.