replace `is_edited?` with `edited?`

.rubocop_todo.yml

@@ -243,7 +243,9 @@ Style/PerlBackrefs:
 # NamePrefixBlacklist: is_, has_, have_
 # NameWhitelist: is_a?
 Style/PredicateName:
-  Enabled: false
+  Enabled: true
+  # NamePrefix: is_
+  NamePrefixBlacklist: is_
 # Offense count: 58
 # Cop supports --auto-correct.

app/controllers/projects/issues_controller.rb

@@ -202,7 +202,7 @@ class Projects::IssuesController < Projects::ApplicationController
       task_status: @issue.task_status
     }
-    if @issue.is_edited?
+    if @issue.edited?
       response[:updated_at] = @issue.updated_at
       response[:updated_by_name] = @issue.last_edited_by.name
       response[:updated_by_path] = user_path(@issue.last_edited_by)

app/helpers/application_helper.rb

@@ -178,7 +178,7 @@ module ApplicationHelper
   end
   def edited_time_ago_with_tooltip(object, placement: 'top', html_class: 'time_ago', exclude_author: false)
-    return unless object.is_edited?
+    return unless object.edited?
     content_tag :small, class: 'edited-text' do
       output = content_tag(:span, 'Edited ')

app/helpers/issuables_helper.rb

@@ -229,7 +229,7 @@ module IssuablesHelper
   end
   def updated_at_by(issuable)
-    return {} unless issuable.is_edited?
+    return {} unless issuable.edited?
     {
       updatedAt: issuable.updated_at.to_time.iso8601,

app/models/concerns/editable.rb

 module Editable
   extend ActiveSupport::Concern
-  def is_edited?
+  def edited?
     last_edited_at.present? && last_edited_at != created_at
   end

spec/models/concerns/editable_spec.rb

 require 'spec_helper'
 describe Editable do
-  describe '#is_edited?' do
+  describe '#edited?' do
     let(:issue) { create(:issue, last_edited_at: nil) }
     let(:edited_issue) { create(:issue, created_at: 3.days.ago, last_edited_at: 2.days.ago) }
-    it { expect(issue.is_edited?).to eq(false) }
-    it { expect(edited_issue.is_edited?).to eq(true) }
+    it { expect(issue.edited?).to eq(false) }
+    it { expect(edited_issue.edited?).to eq(true) }
   end
 end