Wakatime badge added

Author: Vitexus

README.md

@@ -9,6 +9,7 @@ CZ: PHP Knihovna pro snadnou práci s API [Subreg.cz](https://subreg.cz/manual/)
 [![Source Code](http://img.shields.io/badge/source/Spoje-NET/php-subreg-blue.svg?style=flat-square)](https://github.com/Spoje-NET/php-subreg)
 [![Latest Version](https://img.shields.io/github/release/Spoje-NET/php-subreg.svg?style=flat-square)](https://github.com/Spoje-NET/php-subreg/releases)
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+[![time tracker](https://wakatime.com/badge/github/Spoje-NET/php-subreg.svg)](https://wakatime.com/badge/github/Spoje-NET/php-subreg)
 [![Build Status](https://img.shields.io/travis/Spoje-NET/php-subreg/master.svg?style=flat-square)](https://travis-ci.org/Spoje-NET/php-subreg)
 [![Code Coverage](https://scrutinizer-ci.com/g/Spoje-NET/php-subreg/badges/coverage.png?b=master)](https://scrutinizer-ci.com/g/Spoje-NET/php-subreg/?branch=master)
 [![Docker pulls](https://img.shields.io/docker/pulls/vitexsoftware/php-subreg.svg)](https://hub.docker.com/r/vitexsoftware/php-subreg/)