关于 .ios/Pods/FMDB/src/fmdb/FMDatabaseQueue.m:101:9: warning: 'dispatch_queue_set_specific' is only available on iOS 5.0 or newer [-Wunguarded-availability]

.ios/Runner.xcodeproj/project.pbxproj 里FMDB的IPHONEOS_DEPLOYMENT_TARGET设置成了4.3，改成8.0