Fix version

Signed-off-by: Aron Heinecke <aron.heinecke@t-online.de>

Author: 0xpr03

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "yayd-backend"
-version = "0.6.3"
+version = "0.6.4"
 authors = ["Aron Heinecke <Ox0p54r36@t-online.de>"]
 
 [[bin]]

Cargo.toml

@@ -33,7 +33,7 @@ use lib::Error;
 use std::sync::Arc;
 use timer::Timer;
 
-const VERSION: &'static str = "0.6.3";
+const VERSION: &'static str = env!("CARGO_PKG_VERSION");
 const CONFIG_PATH: &'static str = "config.cfg";
 const C_USER_AGENT: &'static str = "hyper/yayd (github.com/0xpr03/yayd)";
 const LOG_CONFIG: &'static str = "logger.yaml";