Update Readme

README.md

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 # CenterDevice API Client for Rust
 
-[![Linux Build Status](https://circleci.com/gh/CenterDevice/centerdevice-rs.svg?style=shield)](https://circleci.com/gh/CenterDevice/centerdevice-rs) [![codecov](https://codecov.io/gh/centerdevice/centerdevice-rs/branch/master/graph/badge.svg)](https://codecov.io/gh/centerdevice/centerdevice-rs) [![GitHub release](https://img.shields.io/github/release/centerdevice/centerdevice-rs.svg)](https:/centerdevice/centerdevice-rs/releases) [![](https://img.shields.io/crates/v/centerdevice-rs.svg)](https://crates.io/crates/centerdevice-rs) [![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg?label=License)](./LICENSE)
+[![](https://img.shields.io/crates/v/centerdevice-rs.svg)](https://crates.io/crates/centerdevice-rs) [![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg?label=License)](./LICENSE)
 
 `centerdevice-rs` is a partial [Rust](https://rust-lang.org) API binding library for [CenterDevice](https://centerdevice.de).
 
+Please note this crate is an alpha version and not officially supported. Still, feel free to use it and to report any issues you may encounter. We will try our best to sort it out.
+
 ## Changelog
 
 Please see the [CHANGELOG](CHANGELOG.md) for a release history.