FIX: Bot mentioned check should be case insensitive.

plugins/discourse-narrative-bot/lib/discourse_narrative_bot/track_selector.rb

@@ -245,13 +245,13 @@ module DiscourseNarrativeBot
 
     def bot_mentioned?
       @bot_mentioned ||= PostAnalyzer.new(@post.raw, @post.topic_id).raw_mentions.include?(
-        self.discobot_user.username
+        self.discobot_user.username.downcase
       )
     end
 
     def public_reply?
       !SiteSetting.discourse_narrative_bot_disable_public_replies &&
-        (bot_mentioned? || reply_to_bot_post?(@post))
+        (reply_to_bot_post?(@post) || bot_mentioned?)
     end
 
     def terminate_track(data)

plugins/discourse-narrative-bot/spec/discourse_narrative_bot/track_selector_spec.rb

@@ -427,6 +427,16 @@ describe DiscourseNarrativeBot::TrackSelector do
           expect(new_post.raw).to eq(random_mention_reply)
         end
 
+        it "should be case insensitive towards discobot's username" do
+          discobot_user.update!(username: 'DisCoBot')
+
+          post.update!(raw: 'Show me what you can do @discobot')
+          described_class.new(:reply, user, post_id: post.id).select
+          new_post = Post.last
+          expect(new_post.raw).to eq(random_mention_reply)
+        end
+
+
         describe 'rate limiting random reply message in public topic' do
           let(:topic) { Fabricate(:topic) }
           let(:other_post) { Fabricate(:post, raw: '@discobot show me something', topic: topic) }