fix: add missing imports

Author: christolis

application/src/main/java/org/togetherjava/tjbot/features/Features.java

@@ -2,6 +2,8 @@
 
 import net.dv8tion.jda.api.JDA;
 
+import org.togetherjava.tjbot.commands.github.GitHubCommand;
+import org.togetherjava.tjbot.commands.github.GitHubReference;
 import org.togetherjava.tjbot.config.Config;
 import org.togetherjava.tjbot.config.FeatureBlacklist;
 import org.togetherjava.tjbot.config.FeatureBlacklistConfig;