Bundle update rubocop and auto correct style issues

spec/api/v1/user/financial_transactions_spec.rb

@@ -21,7 +21,7 @@ describe Api::V1::User::FinancialTransactionsController, type: :controller do
     before { request }
 
     it "returns status 200" do
-      expect(response.status).to eq 200
+      expect(response).to have_http_status :ok
     end
   end
 

spec/api/v1/user/group_order_articles_spec.rb

@@ -23,7 +23,7 @@ describe Api::V1::User::GroupOrderArticlesController, type: :controller do
     before { request }
 
     it "returns status 200" do
-      expect(response.status).to eq 200
+      expect(response).to have_http_status :ok
     end
 
     it "returns the order_article" do

spec/integration/balancing_spec.rb

@@ -113,7 +113,7 @@ feature 'settling an order', js: true do
       click_link I18n.t('ui.edit')
     end
     within("#edit_order_article_#{oa.id}") do
-      find('#order_article_units_to_order').set(0)
+      find_by_id('order_article_units_to_order').set(0)
       sleep 0.25
       find('input[type="submit"]').click
     end
@@ -135,7 +135,7 @@ feature 'settling an order', js: true do
     expect(page).to have_selector('form#new_group_order_article')
     within('#new_group_order_article') do
       select user.ordergroup.name, :from => 'group_order_article_ordergroup_id'
-      find('#group_order_article_result').set(8)
+      find_by_id('group_order_article_result').set(8)
       sleep 0.25
       find('input[type="submit"]').click
     end
@@ -174,7 +174,7 @@ feature 'settling an order', js: true do
     click_link I18n.t('finance.balancing.edit_results_by_articles.add_article')
     expect(page).to have_selector('form#new_order_article')
     within('#new_order_article') do
-      find('#order_article_article_id').select(new_article.name)
+      find_by_id('order_article_article_id').select(new_article.name)
       sleep 0.25
       find('input[type="submit"]').click
     end

spec/lib/bank_account_information_importer_spec.rb

@@ -4,8 +4,7 @@ describe BankTransaction do
   let(:bank_account) { create :bank_account }
 
   it 'empty content' do
-    content = <<-JSON
-    JSON
+    content = ''
 
     importer = BankAccountInformationImporter.new(bank_account)
     expect(importer.import!(content)).to be_nil