rename branch to main

Author: sokra

.github/workflows/test.yml

@@ -3,10 +3,10 @@ name: Test
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
     branches:
-      - master
+      - main
 
 jobs:
   lint:

README.md

@@ -128,13 +128,13 @@ var fileTimes = wp.getTimes();
 // key: absolute path, value: timestamp as number
 ```
 
-[build-status]: https://travis-ci.org/webpack/watchpack.svg?branch=master
+[build-status]: https://travis-ci.org/webpack/watchpack.svg?branch=main
 [build-status-url]: https://travis-ci.org/webpack/watchpack
-[build-status-veyor]: https://ci.appveyor.com/api/projects/status/e5u2qvmugtv0r647/branch/master?svg=true
-[build-status-veyor-url]: https://ci.appveyor.com/project/sokra/watchpack/branch/master
+[build-status-veyor]: https://ci.appveyor.com/api/projects/status/e5u2qvmugtv0r647/branch/main?svg=true
+[build-status-veyor-url]: https://ci.appveyor.com/project/sokra/watchpack/branch/main
 [coveralls-url]: https://coveralls.io/r/webpack/watchpack/
 [coveralls-image]: https://img.shields.io/coveralls/webpack/watchpack.svg
-[codecov]: https://codecov.io/gh/webpack/watchpack/branch/master/graph/badge.svg
+[codecov]: https://codecov.io/gh/webpack/watchpack/branch/main/graph/badge.svg
 [codecov-url]: https://codecov.io/gh/webpack/watchpack
 [downloads]: https://img.shields.io/npm/dm/watchpack.svg
 [downloads-url]: https://www.npmjs.com/package/watchpack