Merge pull request #15 from AerialX/serde-0.8

Update to serde 0.8

Author: reem

Cargo.toml

@@ -9,7 +9,7 @@ repository = "https://github.com/reem/rust-ordered-float"
 
 [dependencies]
 num-traits = { version = "0.1", default_features = false }
-serde = { version = "0.7", optional = true }
+serde = { version = "0.8", optional = true }
 rustc-serialize = { version = "0.3", optional = true }
 unreachable = "0.1"