update docs.rs badge

Author: wangfenjin

README.md

@@ -4,7 +4,7 @@
 [![dependency status](https://deps.rs/repo/github/wangfenjin/duckdb-rs/status.svg)](https://deps.rs/repo/github/wangfenjin/duckdb-rs)
 [![codecov](https://codecov.io/gh/wangfenjin/duckdb-rs/branch/main/graph/badge.svg?token=0xV88q8KU0)](https://codecov.io/gh/wangfenjin/duckdb-rs)
 [![Latest Version](https://img.shields.io/crates/v/duckdb.svg)](https://crates.io/crates/duckdb)
-[![Docs](https://docs.rs/duckdb/badge.svg)](https://docs.rs/duckdb)
+[![Docs](https://img.shields.io/badge/docs.rs-duckdb-green)](https://docs.rs/duckdb)
 
 duckdb-rs is an ergonomic wrapper for using [duckdb](https://github.com/duckdb/duckdb) from Rust. It attempts to expose
 an interface similar to [rusqlite](https://github.com/rusqlite/rusqlite). Acctually the initial code and even this README is