added semaphoreci build badge at README file

Author: iqhater

README.md

@@ -1,14 +1,13 @@
 
 <h1 align="center">Get Youtube Thumbnail</h1>
-<!-- <div align="center">
-<a href="https://github.com/goreleaser/goreleaser/releases/tag/v0.45.1">
-<img src="https://img.shields.io/github/release/qubyte/rubidium.svg?style=flat-square" alt="latest-release"></a>
-<a href="https://semaphoreci.com/docs/how-to-get-build-badge.html">
-<img src="https://img.shields.io/travis/rust-lang/rust.svg?style=flat-square" alt="build-passing"></a>
-<a href="https://codecov.io/">
-<img src="https://img.shields.io/scrutinizer/coverage/g/filp/whoops.svg?style=flat-square" alt="code-coverage"></a>
+<div align="center">
+<!-- <a href="https://github.com/goreleaser/goreleaser/releases/tag/v0.45.1">
+<img src="https://img.shields.io/github/release/qubyte/rubidium.svg?style=flat-square" alt="latest-release"></a> -->
+<a href='https://semaphoreci.com/iqhater/get-youtube-thumbnail'> <img src='https://semaphoreci.com/api/v1/iqhater/get-youtube-thumbnail/branches/master/badge.svg' alt='Build Status'></a>
+<!-- <a href="https://codecov.io/">
+<img src="https://img.shields.io/scrutinizer/coverage/g/filp/whoops.svg?style=flat-square" alt="code-coverage"></a> -->
 </div>
-<hr> -->
+<hr>
 
 By default, get_youtube_thumbnail gets a max resolution image, if image has been not found, get_youtube_thumbnail try to getting a high resolution image.