Ruby 3.1 support (#122)

* Update supported ruby version

* Update bundler

* Fix typo in README

.ruby-version

@@ -1 +1 @@
-3.0.0
+3.1.2

.travis.yml

@@ -6,6 +6,7 @@ rvm:
   - 2.6.6
   - 2.7.2
   - 3.0.0
+  - 3.1.2
 before_install:
   - gem update --system
   - gem update bundler

README.md

@@ -15,7 +15,7 @@
 
 ## Getting Started
 
-Before installing and using microformats-ruby, you'll want to have Ruby 2.4.10 (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).
+Before installing and using microformats-ruby, you'll want to have Ruby 2.4.10 (or newer) installed. It's recommended that you use a Ruby version management tool like [rbenv](https://github.com/rbenv/rbenv), [chruby](https://github.com/postmodern/chruby), or [rvm](https://github.com/rvm/rvm).
 
 microformats-ruby is developed using Ruby 2.7.1 and is additionally tested against versions 2.4.10, 2.5.8, and 2.6.6 using [Travis CI](https://travis-ci.org/microformats/microformats-ruby).
 

microformats.gemspec

@@ -4,7 +4,7 @@ $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'microformats/version'
 
 Gem::Specification.new do |spec|
-  spec.required_ruby_version = ['>= 2.4', '< 3.1']
+  spec.required_ruby_version = ['>= 2.4', '< 3.2']
 
   spec.name          = 'microformats'
   spec.version       = Microformats::VERSION
@@ -23,7 +23,7 @@ Gem::Specification.new do |spec|
 
   spec.post_install_message = 'Prior to version 4.0.0, the microformats gem was named "microformats2."'
 
-  spec.add_development_dependency 'bundler', '>= 1.16.2', '< 2.3'
+  spec.add_development_dependency 'bundler', '>= 1.16.2', '< 2.4'
   spec.add_development_dependency 'guard-rspec', '~> 4.7'
   spec.add_development_dependency 'rake', '~> 12.3'
   spec.add_development_dependency 'rb-fsevent', '~> 0.10.3'