Fix armeria server bootstrapping example (#396)
Fix armeria server bootstrapping example (#396)

Add missing `.join()` call so that startup failure is not swallowed up
jmostella/armeria,trustin/armeria,dongjinleekr/armeria,kojilin/armeria,trustin/armeria,jmostella/armeria,kojilin/armeria,anuraaga/armeria,jonefeewang/armeria,anuraaga/armeria,anuraaga/armeria,minwoox/armeria,jmostella/armeria,trustin/armeria,kojilin/armeria,trustin/armeria,jonefeewang/armeria,dongjinleekr/armeria,minwoox/armeria,imasahiro/armeria,jmostella/armeria,jmostella/armeria,line/armeria,minwoox/armeria,anuraaga/armeria,imasahiro/armeria,jonefeewang/armeria,imasahiro/armeria,anuraaga/armeria,dongjinleekr/armeria,line/armeria,minwoox/armeria,jonefeewang/armeria,anuraaga/armeria,kojilin/armeria,jonefeewang/armeria,line/armeria,imasahiro/armeria,trustin/armeria,line/armeria,dongjinleekr/armeria,kojilin/armeria,minwoox/armeria,imasahiro/armeria,dongjinleekr/armeria,line/armeria,trustin/armeria,line/armeria,kojilin/armeria,minwoox/armeria