Update README.md (#355)

Author: ViralBShah

README.md

@@ -11,8 +11,8 @@
 [![ColPrac: Contributor's Guide on Collaborative Practices for Community Packages](https://img.shields.io/badge/ColPrac-Contributor's%20Guide-blueviolet)](https://github.com/SciML/ColPrac)
 
 **Docs:**
-[![](https://img.shields.io/badge/docs-master-blue.svg)](https://JuliaDiff.github.io/ChainRulesCore.jl/dev)
-[![](https://img.shields.io/badge/docs-stable-blue.svg)](https://JuliaDiff.github.io/ChainRulesCore.jl/stable)
+[![](https://img.shields.io/badge/docs-master-blue.svg)](https://juliadiff.org/ChainRulesCore.jl/dev)
+[![](https://img.shields.io/badge/docs-stable-blue.svg)](https://juliadiff.org/ChainRulesCore.jl/stable)
 
 The ChainRules package provides a variety of common utilities that can be used by downstream automatic differentiation (AD) tools to define and execute forward-, reverse-, and mixed-mode primitives.