Auto merge of #324 - Svenito:patch-1, r=Hoverbear

Add CI badges

FIX #315

<!-- 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-url/324)
<!-- Reviewable:end -->

Author: bors-servo

Cargo.toml

@@ -12,6 +12,10 @@ keywords = ["url", "parser"]
 categories = ["parser-implementations", "web-programming", "encoding"]
 license = "MIT/Apache-2.0"
 
+[badges]
+travis-ci = { repository = "servo/rust-url" }
+appveyor = { repository = "servo/rust-url" }
+
 [workspace]
 members = [".", "idna", "url_serde"]