Make README code example compile

Author: AfoHT

bindings/rust/README.md

@@ -12,16 +12,16 @@ fn main() {
     let arm_code32: Vec<u8> = vec![0x17, 0x00, 0x40, 0xe2]; // sub r0, #23
 
     let mut unicorn = Unicorn::new(Arch::ARM, Mode::LITTLE_ENDIAN).expect("failed to initialize Unicorn instance");
-    let mut emu = unicorn.borrow();
+    let emu = &mut unicorn;
     emu.mem_map(0x1000, 0x4000, Permission::ALL).expect("failed to map code page");
     emu.mem_write(0x1000, &arm_code32).expect("failed to write instructions");
 
     emu.reg_write(RegisterARM::R0, 123).expect("failed write R0");
     emu.reg_write(RegisterARM::R5, 1337).expect("failed write R5");
 
     let _ = emu.emu_start(0x1000, (0x1000 + arm_code32.len()) as u64, 10 * SECOND_SCALE, 1000);
-    assert_eq!(emu.reg_read(RegisterARM::R0, Ok(100));
-    assert_eq!(emu.reg_read(RegisterARM::R5, Ok(1337));
+    assert_eq!(emu.reg_read(RegisterARM::R0), Ok(100));
+    assert_eq!(emu.reg_read(RegisterARM::R5), Ok(1337));
 }
 ```
 Further sample code can be found in ```tests/unicorn.rs```.