docs: updates docs to use latest version

Author: jmgilman

README.md

@@ -31,7 +31,7 @@ Add rustify as a dependency to your cargo.toml:
 
 ```toml
 [dependencies]
-rustify = "0.5.4"
+rustify = "0.6.0"
 rustify_derive = "0.5.2"
 ```
 

src/lib.rs

@@ -31,8 +31,8 @@
 //!
 //! ```ignore
 //! [dependencies]
-//! rustify = "0.5.4"
-//! rustify_derive = "0.5.2"
+//! rustify = "0.6.0"
+//! rustify_derive = "0.5.3"
 //! ```
 //!
 //! ## Usage