task: rename main branch (#921)

Author: jryanconklin

Diff for: .github/PULL_REQUEST_TEMPLATE.md

@@ -5,7 +5,7 @@ Closes Issue #X
 <!--
 These markdown comments are for description only. They can be deleted.
 
-Please submit pull requests against the master branch.
+Please submit pull requests against the main branch.
 
 Follow the existing code style. Check the tests succeed, including lint.
   npm run test

Diff for: .travis.yml

@@ -39,4 +39,4 @@ deploy:
   skip_cleanup: true
   on:
     repo: phase2/particle
-    branch: master
+    branch: main

Diff for: README.md

@@ -1,7 +1,7 @@
 # Particle: A design system integrating to Pattern Lab and a Drupal 8 theme
 
 [![GitHub (pre-)release](https://img.shields.io/github/release/phase2/particle/all.svg)](https://github.com/phase2/particle/releases)
-[![Build Status](https://travis-ci.org/phase2/particle.svg?branch=master)](https://travis-ci.org/phase2/particle)
+[![Build Status](https://travis-ci.org/phase2/particle.svg?branch=main)](https://travis-ci.org/phase2/particle)
 [![Greenkeeper badge](https://badges.greenkeeper.io/phase2/particle.svg)](https://greenkeeper.io/)
 
 ![Particle mascot: Astrogoat](apps/pl-default/pattern-lab/_patterns/01-atoms-demo/image/astrogoat.png?raw=true 'Astrogoat')

Diff for: composer.json

@@ -13,6 +13,6 @@
   "support": {
     "docs": "https://phase2.github.io/frontend-docs/",
     "issues": "https://github.com/phase2/particle/issues",
-    "source": "https://github.com/phase2/particle/tree/master"
+    "source": "https://github.com/phase2/particle/tree/main"
   }
 }

Diff for: renovate.json

@@ -1,6 +1,6 @@
 {
   "extends": ["config:base"],
-  "baseBranches": ["master"],
+  "baseBranches": ["main"],
   "bumpVersion": null,
   "labels": ["dependency update"],
   "patch": {