Fix hits badge on README.md

[silentsoft]

The hits badge in README.md doesn't seem to work properly.

I also used hits.dwyl.io but a few months ago the service suddenly stopped working with a 502 response.

A few months later that happen, the service is up with hits.dwyl.com not hits.dwyl.io.
but most importantly, the hits count for all links are gone.
and it was so sad that my hits also disappeared so I tried looking for other hit services that support count migration, but I couldn't find that kind of thing.

So I just made Hits service that supports count migration.

In the case of JFoenix, I think [![Hits](https://hits.sh/github.com/sshahine/jfoenix.svg?extraCount=115000)](https://hits.sh) is suitable. (If I remember correctly, the last hits count for JFoenix was around 115000)

I hope my service is helpful to you.

Thanks,