update build status

Author: Licenser

README.md

@@ -1,7 +1,7 @@
-# SIMD Json for Rust   [![Build Status]][circleci.com] [![Windows Build Status]][appveyor.com] [![Latest Version]][crates.io]
+# SIMD Json for Rust   [![Build Status]][drone.io] [![Windows Build Status]][appveyor.com] [![Latest Version]][crates.io]
 
-[Build Status]: https://circleci.com/gh/Licenser/simdjson-rs/tree/master.svg?style=svg
-[circleci.com]: https://circleci.com/gh/Licenser/simdjson-rs/tree/master
+[Build Status]: https://cloud.drone.io/api/badges/Licenser/simdjson-rs/status.svg
+[drone.io]: https://cloud.drone.io/Licenser/simdjson-rs
 [Windows Build Status]: https://ci.appveyor.com/api/projects/status/0kf0v6hj5v2gite9?svg=true
 [appveyor.com]: https://ci.appveyor.com/project/Licenser/simdjson-rs
 [Latest Version]: https://img.shields.io/crates/v/simd-json.svg