Upgrade hex to 0.2

Author: sfackler

Cargo.toml

@@ -28,7 +28,7 @@ bufstream = "0.1"
 byteorder = "0.5"
 log = "0.3"
 phf = "=0.7.14"
-hex = "0.1"
+hex = "0.2"
 net2 = "0.2.16"
 rustc-serialize = { version = "0.3", optional = true }
 chrono = { version = "0.2.14", optional = true }