Auto merge of servo#227 - ignatenkobrain:patch-2, r=emilio

deps: bump encoding_rs to 0.8

<!-- Reviewable:start -->
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/rust-cssparser/227)
<!-- Reviewable:end -->

Author: bors-servo

Cargo.toml

@@ -16,7 +16,7 @@ exclude = ["src/css-parsing-tests/**", "src/big-data-url.css"]
 [dev-dependencies]
 rustc-serialize = "0.3"
 difference = "2.0"
-encoding_rs = "0.7"
+encoding_rs = "0.8"
 
 [dependencies]
 cssparser-macros = {path = "./macros", version = "0.3.3"}