v1.8.0 to fix multiple-definitions linker error

### Releases v1.8.0

1. Fix `multiple-definitions` linker error. Drop `src_cpp` and `src_h` directories
2. Add example `Argument_Complex_Multi` to demonstrate how to avoid `multiple-definitions` linker error in multiple-file projects

README.md

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 [![GitHub](https://img.shields.io/github/license/mashape/apistatus.svg)](https://github.com/khoih-prog/TimerInterrupt/blob/master/LICENSE)
 [![contributions welcome](https://img.shields.io/badge/contributions-welcome-brightgreen.svg?style=flat)](#Contributing)
 [![GitHub issues](https://img.shields.io/github/issues/khoih-prog/TimerInterrupt.svg)](http://github.com/khoih-prog/TimerInterrupt/issues)
-[![star this repo](https://githubbadges.com/star.svg?user=khoih-prog&repo=TimerInterrupt)](https://github.com/khoih-prog/TimerInterrupt)
-[![fork this repo](https://githubbadges.com/fork.svg?user=khoih-prog&repo=TimerInterrupt)](https://github.com/khoih-prog/TimerInterrupt/fork)
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 ## Table of Contents
 

changelog.md

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 [![GitHub](https://img.shields.io/github/license/mashape/apistatus.svg)](https://github.com/khoih-prog/TimerInterrupt/blob/master/LICENSE)
 [![contributions welcome](https://img.shields.io/badge/contributions-welcome-brightgreen.svg?style=flat)](#Contributing)
 [![GitHub issues](https://img.shields.io/github/issues/khoih-prog/TimerInterrupt.svg)](http://github.com/khoih-prog/TimerInterrupt/issues)
-[![star this repo](https://githubbadges.com/star.svg?user=khoih-prog&repo=TimerInterrupt)](https://github.com/khoih-prog/TimerInterrupt)
-[![fork this repo](https://githubbadges.com/fork.svg?user=khoih-prog&repo=TimerInterrupt)](https://github.com/khoih-prog/TimerInterrupt/fork)
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+---
 
 ## Table of Contents