Add Ruby 3.2 to test matrix

Author: jgarber623

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
       fail-fast: false
       matrix:
         # See: https://github.com/actions/runner/issues/849
-        ruby: [2.7, "3.0", 3.1]
+        ruby: [2.7, "3.0", 3.1, 3.2]
     steps:
       - uses: actions/checkout@v3
       - uses: ruby/setup-ruby@v1

CONTRIBUTING.md

@@ -8,7 +8,7 @@ There are a couple ways you can help improve webmention-client-ruby:
 
 ## Getting Started
 
-webmention-client-ruby is developed using Ruby 2.7.7 and is additionally tested against Ruby 3.0 and 3.1 using [GitHub Actions](https://github.com/indieweb/webmention-client-ruby/actions).
+webmention-client-ruby is developed using Ruby 2.7.7 and is additionally tested against Ruby 3.0, 3.1, and 3.2 using [GitHub Actions](https://github.com/indieweb/webmention-client-ruby/actions).
 
 Before making changes to webmention-client-ruby, you'll want to install Ruby 2.7.7. It's recommended that you use a Ruby version managment tool like [rbenv](https://github.com/rbenv/rbenv), [chruby](https://github.com/postmodern/chruby), or [rvm](https://github.com/rvm/rvm). Once you've installed Ruby 2.7.7 using your method of choice, install the project's gems by running:
 

README.md

@@ -19,7 +19,7 @@
 
 Before installing and using webmention-client-ruby, you'll want to have [Ruby](https://www.ruby-lang.org) 2.7 (or newer) installed. It's recommended that you use a Ruby version managment tool like [rbenv](https://github.com/rbenv/rbenv), [chruby](https://github.com/postmodern/chruby), or [rvm](https://github.com/rvm/rvm).
 
-webmention-client-ruby is developed using Ruby 2.7.7 and is additionally tested against Ruby 3.0 and 3.1 using [GitHub Actions](https://github.com/indieweb/webmention-client-ruby/actions).
+webmention-client-ruby is developed using Ruby 2.7.7 and is additionally tested against Ruby 3.0, 3.1, and 3.2 using [GitHub Actions](https://github.com/indieweb/webmention-client-ruby/actions).
 
 ## Installation