Update serde to 0.9.0

Author: nox

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 
 name = "cssparser"
-version = "0.7.4"
+version = "0.8.0"
 authors = [ "Simon Sapin <[email protected]>" ]
 
 description = "Rust implementation of CSS Syntax Level 3"
@@ -20,16 +20,14 @@ tempdir = "0.3"
 
 [dependencies]
 encoding = "0.2"
-heapsize = {version = ">=0.1.1, <0.4.0", optional = true}
+heapsize = {version = "0.3", optional = true}
 matches = "0.1"
-serde = {version = ">=0.6.6, <0.9", optional = true}
+serde = {version = "0.9", optional = true}
 
 [build-dependencies]
 syn = { version = "0.10.6", features = ["full", "visit"]}
 quote = "0.3"
 
 [features]
-serde-serialization = [ "serde" ]
-heap_size = [ "heapsize" ]
 bench = []
 dummy_match_byte = []

src/color.rs

@@ -24,7 +24,7 @@ pub struct RGBA {
 
 #[cfg(feature = "serde")]
 impl Serialize for RGBA {
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer
     {
         (self.red, self.green, self.blue, self.alpha).serialize(serializer)
@@ -33,7 +33,7 @@ impl Serialize for RGBA {
 
 #[cfg(feature = "serde")]
 impl Deserialize for RGBA {
-    fn deserialize<D>(deserializer: &mut D) -> Result<Self, D::Error>
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
         where D: Deserializer
     {
         let (red, green, blue, alpha) =