update version

Cargo.toml

 [package]
 name = "coap"
-version = "0.2.1"
+version = "0.2.2"
 description = "A CoAP library"
 readme = "README.md"
 documentation = "http://covertness.github.io/coap-rs/coap/index.html"

README.md

@@ -17,7 +17,7 @@ First add this to your `Cargo.toml`:
 
 ```toml
 [dependencies]
-coap = "0.2.1"
+coap = "0.2"
 ```
 
 Then, add this to your crate root:

src/lib.rs

@@ -10,7 +10,7 @@
 //! 
 //! ```toml
 //! [dependencies]
-//! coap = "0.2.1"
+//! coap = "0.2"
 //! ```
 //! 
 //! Then, add this to your crate root: