Try make it compile with Travis...

... don't use diamond operators?

bukkit/src/main/java/us/myles/ViaVersion/bukkit/protocol1_12to1_11_1/BukkitInvContainerUpdateTask.java

@@ -20,7 +20,7 @@ public class BukkitInvContainerUpdateTask implements Runnable {
     public BukkitInvContainerUpdateTask(BukkitInvContainerItemProvider provider, UUID uuid) {
         this.provider = provider;
         this.uuid = uuid;
-        this.items = Collections.synchronizedList(new ArrayList<>());
+        this.items = Collections.synchronizedList(new ArrayList<InvItemStorage>());
     }
 
     public void addItem(short windowId, short slotId, short anumber) {

bukkit/src/main/java/us/myles/ViaVersion/bukkit/providers/BukkitInvContainerItemProvider.java

@@ -26,7 +26,7 @@ import us.myles.ViaVersion.util.ReflectionUtil;
 
 public class BukkitInvContainerItemProvider extends InvContainerItemProvider {
 
-    private static Map<UUID, BukkitInvContainerUpdateTask> updateTasks = new ConcurrentHashMap<>();
+    private static Map<UUID, BukkitInvContainerUpdateTask> updateTasks = new ConcurrentHashMap<UUID, BukkitInvContainerUpdateTask>();
     private boolean supported;
     // packet class
     private Class<?> wclickPacketClass;