adapter - Cargo - update hex to 0.4

Author: elpiel

Cargo.lock

@@ -5,12 +5,12 @@ authors = ["Lachezar Lechev <[email protected]>, Omidiora Samuel <[email protected]
 edition = "2018"
 
 [dependencies]
-primitives = {path = "../primitives"}
+primitives = { path = "../primitives" }
 # Time handling
 chrono = "0.4"
 # To/From Hex
-hex = "0.3.2"
-serde =  {version = "^1.0", features = ['derive']}
+hex = "0.4"
+serde = { version = "^1.0", features = ['derive'] }
 serde_json = "1.0"
 serde-hex = "0.1.0"
 # Ethereum