fix rubocop warnings

app/services/projects/import_export/import_export_reader.rb

@@ -38,7 +38,8 @@ module Projects
 
       def process_include(hash, included_classes_hash = {})
         hash.values.flatten.each do |value|
-          current_key, value = process_current_class(hash, included_classes_hash, value)
+          current_key = hash.keys.first
+          value = process_current_class(hash, included_classes_hash, value)
           if included_classes_hash[current_key]
             add_class(current_key, included_classes_hash, value)
           else
@@ -50,14 +51,13 @@ module Projects
 
       def process_current_class(hash, included_classes_hash, value)
         value = value.is_a?(Hash) ? process_include(hash, included_classes_hash) : value
-        current_key = hash.keys.first
-        only_except_hash = check_only_and_except(current_key)
-        included_classes_hash[current_key] ||= only_except_hash unless only_except_hash.empty?
-        return current_key, value
+        only_except_hash = check_only_and_except(hash.keys.first)
+        included_classes_hash[hash.keys.first] ||= only_except_hash unless only_except_hash.empty?
+        value
       end
 
       def add_new_class(current_key, included_classes_hash, value)
-        new_hash = { :include => value }
+        new_hash = { include: value }
         new_hash.merge!(check_only_and_except(value))
         included_classes_hash[current_key] = new_hash
       end
@@ -88,4 +88,4 @@ module Projects
       end
     end
   end
-end
+end
\ No newline at end of file

spec/services/projects/import_export/import_export_reader_spec.rb

@@ -5,14 +5,14 @@ describe Projects::ImportExport::ImportExportReader do
   let(:test_config) { 'spec/support/import_export/import_export.yml' }
   let(:project_tree_hash) do
     {
-      :only => [:name, :path],
-      :include => [:issues, :labels,
-                   { :merge_requests => {
-                     :only => [:id],
-                     :except => [:iid],
-                     :include => [:merge_request_diff, :merge_request_test]
-                   } },
-                   { :commit_statuses => { :include => :commit } }]
+      only: [:name, :path],
+      include: [:issues, :labels,
+                { merge_requests: {
+                  only: [:id],
+                  except: [:iid],
+                  include: [:merge_request_diff, :merge_request_test]
+                } },
+                { commit_statuses: { include: :commit } }]
     }
   end
 
@@ -21,4 +21,4 @@ describe Projects::ImportExport::ImportExportReader do
 
     expect(described_class.project_tree).to eq(project_tree_hash)
   end
-end
+end
\ No newline at end of file