Fix rubocop offenses.

plugin.rb

@@ -42,7 +42,7 @@ after_initialize do
 
     def self.remove_note(user, note_id)
       notes = notes_for(user.id)
-      notes.reject! {|n| n[:id] == note_id}
+      notes.reject! { |n| n[:id] == note_id }
 
       if notes.size > 0
         ::PluginStore.set("staff_notes", key_for(user.id), notes)
@@ -124,10 +124,10 @@ after_initialize do
         # Avoid n+1
         if obj.is_a?(Array)
           by_ids = {}
-          User.where(id: obj.map {|o| o[:created_by] }).each do |u|
+          User.where(id: obj.map { |o| o[:created_by] }).each do |u|
             by_ids[u.id] = u
           end
-          obj.each {|o| o[:created_by] = by_ids[o[:created_by].to_i] }
+          obj.each { |o| o[:created_by] = by_ids[o[:created_by].to_i] }
         else
           obj[:created_by] = User.where(id: obj[:created_by]).first
         end

spec/user_history_spec.rb

@@ -11,7 +11,7 @@ describe UserHistory do
       end
 
       it "should create staff note for suspension" do
-        UserHistory.create!({action: UserHistory.actions[:suspend_user], target_user_id: user.id, acting_user_id: admin.id})
+        UserHistory.create!(action: UserHistory.actions[:suspend_user], target_user_id: user.id, acting_user_id: admin.id)
 
         expect(PluginStore.get('staff_notes', "notes:#{user.id}")).to be_present
       end

spec/user_warning_spec.rb

@@ -12,7 +12,7 @@ describe UserWarning do
       end
 
       it "should create staff note for warning" do
-        UserWarning.create({topic_id: topic.id, user_id: user.id, created_by_id: admin.id})
+        UserWarning.create(topic_id: topic.id, user_id: user.id, created_by_id: admin.id)
 
         expect(PluginStore.get('staff_notes', "notes:#{user.id}")).to be_present
       end