Update to rust 2018

src/engine/map/mod.rs

@@ -1,9 +1,9 @@
 use sfml::graphics::{FloatRect, IntRect};
 use sfml::system::Vector2;
 
-use engine::math::{clamp, Matrix};
-use engine::renderer::Drawable;
-use engine::texture::Texture;
+use crate::engine::math::{clamp, Matrix};
+use crate::engine::renderer::Drawable;
+use crate::engine::texture::Texture;
 
 /// This enum represents if the collision happens on the X axis or the Y axis.
 #[derive(Copy, Clone)]