minor import cleanup

drongo

@@ -1 +1 @@
-Subproject commit 019a3cf34f60da053ca7b5540e2bb7bcee6fbd50
+Subproject commit 27dda9157649b35bc4450361c2f31d489eef492b

src/main/java/com/sparrowwallet/sparrow/io/Storage.java

@@ -1,6 +1,5 @@
 package com.sparrowwallet.sparrow.io;
 
-import com.google.common.io.ByteStreams;
 import com.google.gson.*;
 import com.sparrowwallet.drongo.ExtendedPublicKey;
 import com.sparrowwallet.drongo.crypto.ECKey;