Switch to using main branch

Author: kddejong

CONTRIBUTING.md

@@ -23,7 +23,7 @@ reported the issue. Please try to include as much information as you can. Detail
 ## Contributing via Pull Requests
 Contributions via pull requests are much appreciated. Before sending us a pull request, please ensure that:
 
-1. You are working against the latest source on the *master* branch.
+1. You are working against the latest source on the *main* branch.
 2. You check existing open, and recently merged, pull requests to make sure someone else hasn't addressed the problem already.
 3. You open an issue to discuss any significant work - we would hate for your time to be wasted.
 
@@ -56,6 +56,6 @@ If you discover a potential security issue in this project we ask that you notif
 
 ## Licensing
 
-See the [LICENSE](https://github.com/aws-cloudformation/aws-cloudformation-rpdk-python-plugin/blob/master/LICENSE) file for our project's licensing. We will ask you to confirm the licensing of your contribution.
+See the [LICENSE](https://github.com/aws-cloudformation/aws-cloudformation-rpdk-python-plugin/blob/main/LICENSE) file for our project's licensing. We will ask you to confirm the licensing of your contribution.
 
 We may ask you to sign a [Contributor License Agreement (CLA)](http://en.wikipedia.org/wiki/Contributor_License_Agreement) for larger changes.

README.md

@@ -10,7 +10,7 @@ The CloudFormation Resource Provider Development Kit (RPDK) allows you to author
 
 This plugin library helps to provide runtime bindings for the execution of your providers by CloudFormation.
 
-[![Build Status](https://travis-ci.com/aws-cloudformation/cloudformation-cli-python-plugin.svg?branch=master)](https://travis-ci.com/aws-cloudformation/cloudformation-cli-python-plugin)
+[![Build Status](https://travis-ci.com/aws-cloudformation/cloudformation-cli-python-plugin.svg?branch=main)](https://travis-ci.com/aws-cloudformation/cloudformation-cli-python-plugin)
 
 ## Community
 
@@ -81,7 +81,7 @@ For changes to the plugin, a Python virtual environment is recommended. The deve
 python3 -m venv env
 source env/bin/activate
 pip install -e . -e src/ \
-  -r https://raw.githubusercontent.com/aws-cloudformation/aws-cloudformation-rpdk/master/requirements.txt
+  -r https://raw.githubusercontent.com/aws-cloudformation/cloudformation-cli/master/requirements.txt
 pre-commit install
 ```