Point to the ChainRules docs

Author: nickrobinson251

README.md

@@ -2,7 +2,7 @@
 
 [![Travis](https://travis-ci.org/JuliaDiff/ChainRulesCore.jl.svg?branch=master)](https://travis-ci.org/JuliaDiff/ChainRulesCore.jl)
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 The ChainRulesCore 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.