ModTitles concurrentmodex

[Kakifrucht]

Not really critical, should just be fixed. Happens in very rare conditions.

2016-10-11 19:34:44 [WARN] Exception in thread "Craft Scheduler Thread - 677" 
2016-10-11 19:34:44 [WARN] org.apache.commons.lang.UnhandledException: Plugin HalfminerSystem v3.18.4 generated an exception while executing task 17414
    at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.util.ConcurrentModificationException
    at java.util.HashMap$KeySet.forEach(HashMap.java:935)
    at de.halfminer.hms.modules.ModTitles.lambda$updateTablist$10(ModTitles.java:120)
    at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftTask.run(CraftTask.java:71)
    at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
    ... 3 more