wollet: import iso4217 source since github repo not available

Author: RCasatta

Cargo.lock

@@ -55,7 +55,6 @@ aes-gcm = { version = "0.10", optional = true }
 flate2 = { version = "1.1", optional = true }
 rmpv = { version = "1.3", optional = true, features = ["with-serde"] }
 rmp-serde = { version = "1.3", optional = true }
-iso4217 = { version = "0.3.0", optional = true }
 
 
 #registry
@@ -129,7 +128,7 @@ amp0 = [
     "rmpv",
     "rmp-serde",
 ]
-prices = ["reqwest", "iso4217"]
+prices = ["reqwest"]
 
 [[test]]
 name = "e2e"