chore: replace instances of master with main [skip ci]

README.md

@@ -4,11 +4,11 @@ cli-ux
 cli IO utilities
 
 [![Version](https://img.shields.io/npm/v/cli-ux.svg)](https://npmjs.org/package/cli-ux)
-[![CircleCI](https://circleci.com/gh/oclif/cli-ux/tree/master.svg?style=svg)](https://circleci.com/gh/oclif/cli-ux/tree/master)
-[![Appveyor CI](https://ci.appveyor.com/api/projects/status/github/oclif/cli-ux?branch=master&svg=true)](https://ci.appveyor.com/project/heroku/cli-ux/branch/master)
+[![CircleCI](https://circleci.com/gh/oclif/cli-ux/tree/main.svg?style=svg)](https://circleci.com/gh/oclif/cli-ux/tree/main)
+[![Appveyor CI](https://ci.appveyor.com/api/projects/status/github/oclif/cli-ux?branch=main&svg=true)](https://ci.appveyor.com/project/heroku/cli-ux/branch/main)
 [![Known Vulnerabilities](https://snyk.io/test/npm/cli-ux/badge.svg)](https://snyk.io/test/npm/cli-ux)
 [![Downloads/week](https://img.shields.io/npm/dw/cli-ux.svg)](https://npmjs.org/package/cli-ux)
-[![License](https://img.shields.io/npm/l/cli-ux.svg)](https://github.com/oclif/cli-ux/blob/master/package.json)
+[![License](https://img.shields.io/npm/l/cli-ux.svg)](https://github.com/oclif/cli-ux/blob/main/package.json)
 
 # Usage
 
@@ -312,7 +312,7 @@ bar2:
 PROGRESS | █████████████████████████████░░░░░░░░░░░ | 146/204 Files
 ```
 
-To see a more detailed example, run 
+To see a more detailed example, run
 ```shell script
 $ ts-node examples/progress.ts
 ```