fix: Missing header to allow NOPCH compil

- Now can compile without PCH enabled
- Also fixed wrong module name in travis.yml

src/reward_system.cpp

@@ -3,6 +3,7 @@
 #include "Configuration/Config.h"
 #include "Player.h"
 #include "AccountMgr.h"
+#include "Chat.h"
 #include "ScriptMgr.h"
 #include "Define.h"
 #include "GossipDef.h"
@@ -98,4 +99,4 @@ void AddRewardSystemScripts()
 {
     new reward_system();
     new reward_system_conf();
-}
+}