fixed badge in readme

Author: torfjelde

README.md

@@ -1,6 +1,6 @@
 # Bijectors.jl
 
-[![Stable](https://img.shields.io/badge/docs-stable-blue.svg)](https://turinglang.github.io/Bijectors.jl/stable)
+[![Latest](https://img.shields.io/badge/docs-latest-blue.svg)](https://turinglang.github.io/Bijectors.jl)
 [![Interface tests](https://github.com/TuringLang/Bijectors.jl/workflows/Interface%20tests/badge.svg?branch=master)](https://github.com/TuringLang/Bijectors.jl/actions?query=workflow%3A%22Interface+tests%22+branch%3Amaster)
 [![AD tests](https://github.com/TuringLang/Bijectors.jl/workflows/AD%20tests/badge.svg?branch=master)](https://github.com/TuringLang/Bijectors.jl/actions?query=workflow%3A%22AD+tests%22+branch%3Amaster)