Update dependency version

Cargo.toml

@@ -10,7 +10,7 @@ aes-ctr = '0.6.0'
 async-trait = '0.1'
 chrono = { optional = true, version = '0.4' }
 enum-as-inner = '=0.5.1'
-external-ip = { optional = true, version = '4.1' }
+external-ip = { optional = true, version = '5' }
 failure = '0.1'
 futures = '0.3.1'
 hex = '0.4'