bump version, remove unneeded cause() fn as it now has a provided implementation

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rhai"
-version = "0.5.1"
+version = "0.6.0"
 authors = ["Jonathan Turner", "Lukáš Hozda"]
 description = "Embedded scripting for Rust"
 homepage = "https://github.com/jonathandturner/rhai"

src/parser.rs

@@ -23,10 +23,6 @@ impl Error for LexError {
             LexError::Nothing => "This error is for internal use only"
         }
     }
-
-    fn cause(&self) -> Option<&Error> {
-        None
-    }
 }
 
 impl fmt::Display for LexError {