Drop Ruby 3.1 support (#7)

Ruby 3.1 EOL ended 5 months ago and it's been causing trouble in CI,
since Rails 8 depends on Ruby >= 3.2.

Author: marcoroth

.github/workflows/build.yml

@@ -14,7 +14,6 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - '3.1'
           - '3.2'
           - '3.3'
           - '3.4'

.rubocop.yml

@@ -1,9 +1,10 @@
 AllCops:
   NewCops: enable
   SuggestExtensions: false
-  TargetRubyVersion: 3.1
+  TargetRubyVersion: 3.2
   Exclude:
     - node_modules/**/*
+    - vendor/**/*
 
 Style/StringLiterals:
   Enabled: true

Gemfile

@@ -7,8 +7,8 @@ gemspec
 gem "actionview", "~> 8.0"
 # gem "herb", path: "../herb"
 gem "maxitest"
-gem "minitest-difftastic"
 gem "minitest", "~> 5.16"
+gem "minitest-difftastic"
 gem "railties", "~> 8.0"
 gem "rake", "~> 13.0"
 gem "rubocop", "~> 1.80.1"

lib/reactionview/railtie.rb

@@ -18,9 +18,7 @@ class Railtie < Rails::Railtie
 
     config.after_initialize do
       ActiveSupport.on_load(:action_view) do
-        if ReActionView.config.intercept_erb
-          ActionView::Template.register_template_handler :erb, ReActionView::Template::Handlers::Herb
-        end
+        ActionView::Template.register_template_handler :erb, ReActionView::Template::Handlers::Herb if ReActionView.config.intercept_erb
       end
     end
   end

reactionview.gemspec

@@ -11,7 +11,7 @@ Gem::Specification.new do |spec|
   spec.summary = "An ActionView-compatible ERB engine with modern DX - re-imagined with Herb."
   spec.description = spec.summary
   spec.homepage = "https://reactionview.dev"
-  spec.required_ruby_version = ">= 3.0.0"
+  spec.required_ruby_version = ">= 3.2.0"
 
   spec.metadata["homepage_uri"] = spec.homepage
   spec.metadata["source_code_uri"] = "https://github.com/marcoroth/reactionview"