Support byteorder 0.4

Author: sfackler

Cargo.toml

@@ -10,7 +10,7 @@ documentation = "https://sfackler.github.io/rust-postgres-range/doc/v0.7.3/postg
 [dependencies]
 time = "0.1"
 postgres = ">= 0.9, < 0.11"
-byteorder = "0.3"
+byteorder = ">= 0.3, < 0.5"
 
 [dev-dependencies.postgres]
 features = ["time"]