Bump byteorder requirement to 1.3.0

1.3.0 is the first version that performs auto detection of i128 support,
which we rely on.

Author: dtolnay

Cargo.toml

@@ -17,7 +17,7 @@ license = "MIT"
 description = "A binary serialization / deserialization strategy that uses Serde for transforming structs into bytes and vice versa!"
 
 [dependencies]
-byteorder = "1.2.0"
+byteorder = "1.3.0"
 serde = "1.0.63"
 
 [dev-dependencies]