Chore: Switch to main for primary branch (fixes #161) (#165)

* Chore: Switch to main for primary branch (fixes #161)

The only remaining string search results for "master" are URLs to other
repositories.

* Chore: Use latest eslint-release

This should allow releasing from the `main` branch, which was part of
the 3.1 release. The breaking changes in v2 and v3 dropped support for
older Node versions on the release server. Since it's working in other
eslint org packages, that's not a concern.

.github/workflows/ci.yml

@@ -2,9 +2,9 @@ name: CI
 
 on:
   push:
-    branches: [master]
+    branches: [main]
   pull_request:
-    branches: [master]
+    branches: [main]
 
 jobs:
   lint:

README.md

@@ -1,7 +1,7 @@
 # eslint-plugin-markdown
 
 [![npm Version](https://img.shields.io/npm/v/eslint-plugin-markdown.svg)](https://www.npmjs.com/package/eslint-plugin-markdown)
-[![Build Status](https://img.shields.io/github/workflow/status/eslint/eslint-plugin-markdown/CI/master.svg)](https://github.com/eslint/eslint-plugin-markdown/actions)
+[![Build Status](https://img.shields.io/github/workflow/status/eslint/eslint-plugin-markdown/CI/main.svg)](https://github.com/eslint/eslint-plugin-markdown/actions)
 
 Lint JS, JSX, TypeScript, and more inside Markdown.
 
@@ -12,7 +12,7 @@ Lint JS, JSX, TypeScript, and more inside Markdown.
     alt="A JS code snippet in a Markdown editor has red squiggly underlines. A tooltip explains the problem."
 />
 
-> 🚧 This documentation is for an unfinished v2 release in progress in the `master` branch. The latest stable documentation is in the [`v1` branch](https://github.com/eslint/eslint-plugin-markdown/tree/v1).
+> 🚧 This documentation is for an unfinished v2 release in progress in the `main` branch. The latest stable documentation is in the [`v1` branch](https://github.com/eslint/eslint-plugin-markdown/tree/v1).
 
 ## Usage
 

package.json

@@ -42,7 +42,7 @@
     "eslint-config-eslint": "^6.0.0",
     "eslint-plugin-jsdoc": "^15.9.5",
     "eslint-plugin-node": "^9.0.0",
-    "eslint-release": "^1.2.0",
+    "eslint-release": "^3.1.2",
     "mocha": "^6.2.2",
     "nyc": "^14.1.1"
   },