Changes

Summary

1. synchronize file access to prevent issues (commit: cc74bf8) (details)

Commit cc74bf841a91bbc40cc19c6680cd2fc2461f2df3 by Flo.e3 synchronize file access to prevent issues (commit: cc74bf8)
	src/main/java/codecrafter47/bungeemail/FlatFileBackend.java (diff)