Fix README

README.md

@@ -1,6 +1,6 @@
 <p align="center" style="padding-bottom:20px"><img src="img/utm-dot-codes-logo.png" width="400"></p><p>&nbsp;</p>
 
-[![Build Status](https://travis-ci.org/asdfdotdev/utm.codes.svg?branch=master)](https://travis-ci.org/asdfdotdev/utm.codes) [![codecov](https://codecov.io/gh/asdfdotdev/utm.codes/branch/master/graph/badge.svg)](https://codecov.io/gh/asdfdotdev/utm.codes) [![RIPS CodeRisk](https://coderisk.com/wp/plugin/utm-dot-codes/badge "RIPS CodeRisk")](https://coderisk.com/wp/plugin/utm-dot-codes)
+[![Build Status](https://travis-ci.org/asdfdotdev/utm.codes.svg?branch=main)](https://travis-ci.org/asdfdotdev/utm.codes) [![codecov](https://codecov.io/gh/asdfdotdev/utm.codes/branch/main/graph/badge.svg)](https://codecov.io/gh/asdfdotdev/utm.codes) [![RIPS CodeRisk](https://coderisk.com/wp/plugin/utm-dot-codes/badge "RIPS CodeRisk")](https://coderisk.com/wp/plugin/utm-dot-codes)
 
 Welcome to the developer repository for utm.codes, a WordPress plugin that makes creating analytics friendly marketing links quick and easy.
 
@@ -19,7 +19,7 @@ utm.codes is developed for, and tested with, a variety of recent platform versio
 
 ## Branches
 
-**master** - Contains the latest usable code and will mirror the code available for download from WordPress.org.
+**main** - Contains the latest usable code and will mirror the code available for download from WordPress.org.
 
 **development** - This branch will at times be more experimental and may contain incomplete and/or untested ideas. Please reference latest commit messages/tags for further details. This branch should be used for development and experimentation only and not deployed to a production environment.