Fix rubocop warnings

.rubocop.yml

@@ -3,7 +3,7 @@ require:
 - rubocop-rspec
 
 AllCops:
-  TargetRubyVersion: 2.4
+  TargetRubyVersion: 2.5
 
 Metrics/BlockLength:
   Exclude:

lib/yabeda/rails/config.rb

@@ -4,6 +4,7 @@
 
 module Yabeda
   module Rails
+    # yabeda-rails configuration
     class Config < ::Anyway::Config
       config_name :yabeda_rails
 

lib/yabeda/rails/event.rb

@@ -2,6 +2,7 @@
 
 module Yabeda
   module Rails
+    # ActiveSupport Event with added logic for Yabeda tags formatting
     class Event < ActiveSupport::Notifications::Event
       def labels
         @labels ||= begin

spec/yabeda/rails_spec.rb

@@ -30,15 +30,20 @@ def app
       .with_tags(controller: "hello", action: "internal_server_error", status: 500, method: "get", format: :html)
   end
 
-  it "supports configuring controller name case" do
-    original_case = described_class.config.controller_name_case
-    described_class.config.controller_name_case = :camel
-
-    expect { get "/hello/world" }.to \
-      increment_yabeda_counter(Yabeda.rails.requests_total)
-      .with_tags(controller: "HelloController", action: "world", status: 200, method: "get", format: :html)
-      .by(1)
-
-    described_class.config.controller_name_case = original_case
+  context "with changed controller name case config tp camel case" do
+    around do |example|
+      original_case = described_class.config.controller_name_case
+      described_class.config.controller_name_case = :camel
+      example.call
+    ensure
+      described_class.config.controller_name_case = original_case
+    end
+
+    it "reports controller tag in camel case" do
+      expect { get "/hello/world" }.to \
+        increment_yabeda_counter(Yabeda.rails.requests_total)
+        .with_tags(controller: "HelloController", action: "world", status: 200, method: "get", format: :html)
+        .by(1)
+    end
   end
 end

yabeda-rails.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.required_ruby_version = ">= 2.4"
+  spec.required_ruby_version = ">= 2.5"
 
   spec.add_dependency "activesupport"
   spec.add_dependency "anyway_config", ">= 1.3", "< 3"