"ConcurrentModificationException"
Occasionally getting this error, which a popup asked me to report:
```
Dec-15 20:25:02.360 [JavaFX Application Thread] ERROR haveno.common.setup.CommonSetup: Uncaught Exception from thread JavaFX Application Thread, error=null
 java.util.ConcurrentModificationException: null
        at java.base/java.util.HashMap$HashIterator.nextNode(HashMap.java:1605)
        at java.base/java.util.HashMap$KeyIterator.next(HashMap.java:1628)
        at java.base/java.util.AbstractCollection.addAll(AbstractCollection.java:337)
        at haveno.common.app.Capabilities.<init>(Capabilities.java:63)
        at haveno.common.app.Capabilities.<init>(Capabilities.java:58)
        at haveno.network.p2p.peers.PeerManager.lambda$getConnectedReportedPeers$35(PeerManager.java:767)
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) 
        at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1715)
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
        at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
        at haveno.network.p2p.peers.PeerManager.getConnectedReportedPeers(PeerManager.java:800)
        at haveno.network.p2p.peers.PeerManager.getLivePeers(PeerManager.java:398)
        at haveno.network.p2p.peers.peerexchange.PeerExchangeHandler.sendGetPeersRequest(PeerExchangeHandler.java:105)
        at haveno.network.p2p.peers.peerexchange.PeerExchangeHandler.lambda$sendGetPeersRequestAfterRandomDelay$0(PeerExchangeHandler.java:96)
        at haveno.common.UserThread.lambda$execute$0(UserThread.java:64)
        at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:456)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
        at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:455)
        at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
        at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
        at javafx.graphics/com.sun.glass.ui.gtk.GtkApplication.lambda$runLoop$10(GtkApplication.java:263)
        at java.base/java.lang.Thread.run(Thread.java:1583)
```