Merge pull request #223 from JuliaDiff/master

fix references to master

Author: oxinabox

README.md

@@ -1,12 +1,12 @@
 # ChainRulesTestUtils.jl
 
-[![CI](https://github.com/JuliaDiff/ChainRulesTestUtils.jl/workflows/CI/badge.svg?branch=master)](https://github.com/JuliaDiff/ChainRulesTestUtils.jl/actions?query=workflow%3ACI)
+[![CI](https://github.com/JuliaDiff/ChainRulesTestUtils.jl/workflows/CI/badge.svg?branch=main)](https://github.com/JuliaDiff/ChainRulesTestUtils.jl/actions?query=workflow%3ACI)
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-[![](https://img.shields.io/badge/docs-master-blue.svg)](https://JuliaDiff.github.io/ChainRulesTestUtils.jl/dev)
+[![](https://img.shields.io/badge/docs-main-blue.svg)](https://JuliaDiff.github.io/ChainRulesTestUtils.jl/dev)
 [![](https://img.shields.io/badge/docs-stable-blue.svg)](https://JuliaDiff.github.io/ChainRulesTestUtils.jl/stable)
 
 > Collection of utilities for testing forward- and reverse-mode AD sensitivities.

docs/src/index.md

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 # ChainRulesTestUtils
 
-[![CI](https://github.com/JuliaDiff/ChainRulesTestUtils.jl/workflows/CI/badge.svg?branch=master)](https://github.com/JuliaDiff/ChainRulesTestUtils.jl/actions?query=workflow%3ACI)
+[![CI](https://github.com/JuliaDiff/ChainRulesTestUtils.jl/workflows/CI/badge.svg?branch=main)](https://github.com/JuliaDiff/ChainRulesTestUtils.jl/actions?query=workflow%3ACI)
 [![Code Style: Blue](https://img.shields.io/badge/code%20style-blue-4495d1.svg)](https://github.com/invenia/BlueStyle)
 
 
 [ChainRulesTestUtils.jl](https://github.com/JuliaDiff/ChainRulesTestUtils.jl) helps you test [`ChainRulesCore.frule`](http://www.juliadiff.org/ChainRulesCore.jl/dev/api.html) and [`ChainRulesCore.rrule`](http://www.juliadiff.org/ChainRulesCore.jl/dev/api.html) methods, when adding rules for your functions in your own packages.
 For information about ChainRules, including how to write rules, refer to the general ChainRules Documentation:
-[![](https://img.shields.io/badge/docs-master-blue.svg)](https://JuliaDiff.github.io/ChainRulesCore.jl/dev)
+[![](https://img.shields.io/badge/docs-main-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)
 
 ## Canonical example