replace master branch name with main

CONTRIBUTING.md

@@ -8,15 +8,15 @@ Thanks for wanting to make this component better!
 2.  `yarn install` and `yarn dev` to install dependencies and spin up the demo site locally
 3.  Create a branch for your PR
 
-**Tip:** Keep your master branch pointing at the original repository and make pull requests from branches on your fork. To do this, run:
+**Tip:** Keep your main branch pointing at the original repository and make pull requests from branches on your fork. To do this, run:
 
 ```bash
 git remote add upstream https://github.com/roginfarrer/react-collapsed.git
 git fetch upstream
-git branch --set-upstream-to=upstream/master master
+git branch --set-upstream-to=upstream/main main
 ```
 
-This will add the original repository as a "remote" called "upstream," Then fetch the git information from that remote, then set your local master branch to use the upstream master branch whenever you run git pull. Then you can make all of your pull request branches based on this master branch. Whenever you want to update your version of master, do a regular git pull.
+This will add the original repository as a "remote" called "upstream," Then fetch the git information from that remote, then set your local main branch to use the upstream main branch whenever you run git pull. Then you can make all of your pull request branches based on this main branch. Whenever you want to update your version of main, do a regular git pull.
 
 ### Committing and Pushing changes
 

README.md

@@ -160,6 +160,6 @@ To avoid this, simply move that padding from the element to an element directly
 [npm-badge]: http://img.shields.io/npm/v/react-collapsed.svg?style=flat
 [npm-version]: https://npmjs.org/package/react-collapsed 'View this project on npm'
 [ci-badge]: https://github.com/roginfarrer/react-collapsed/workflows/CI/badge.svg
-[ci]: https://github.com/roginfarrer/react-collapsed/actions?query=workflow%3ACI+branch%3Amaster
+[ci]: https://github.com/roginfarrer/react-collapsed/actions?query=workflow%3ACI+branch%3Amain
 [netlify]: https://app.netlify.com/sites/react-collapsed/deploys
 [netlify-badge]: https://api.netlify.com/api/v1/badges/4d285ffc-aa4f-4d32-8549-eb58e00dd2d1/deploy-status