Update readme and manifest for publishing new crate version.

Cargo.toml

 
 [package]
 name = "mavlink"
-version = "0.4.2"
+version = "0.5.0"
 authors = ["Todd Stellanova", "Michal Podhradsky", "Kevin Mehall", "Tim Ryan"]
 build = "build/main.rs"
 description = "Implements the MAVLink data interchange format for UAVs."
+readme = "README.md"
 license = "MIT/Apache-2.0"
-repository = "https://github.com/3drobotics/rust-mavlink"
+repository = "https://github.com/mavlink/rust-mavlink"
 
 [build-dependencies]
 crc16 = "0.3.3"

README.md

@@ -6,7 +6,7 @@ with bindings for the [common message set](http://mavlink.org/messages/common).
 Add to your Cargo.toml:
 
 ```
-mavlink = "0.4"
+mavlink = "0.5"
 ```
 
 See [src/bin/mavlink-dump.rs](src/bin/mavlink-dump.rs) for a usage example.