use new readline crate

src/main.rs

@@ -1,7 +1,7 @@
 #[macro_use] extern crate downcast;
 #[macro_use] extern crate prolog_parser;
 
-extern crate readline_sys;
+extern crate readline_rs;
 extern crate termion;
 
 mod prolog;

src/prolog/read.rs

@@ -11,7 +11,7 @@ use prolog::machine::machine_state::MachineState;
 use std::collections::VecDeque;
 use std::io::Read;
 
-use readline_sys::readline::*;
+use readline_rs::readline::*;
 
 type SubtermDeque = VecDeque<(usize, usize)>;