Clippy says to remove `use leap;` at the beginning (#987)
Clippy says to remove `use leap;` at the beginning (#987)

```
warning: this import is redundant
 --> tests/leap.rs:1:1
  |
1 | use leap;
  | ^^^^^^^^^ help: remove it entirely
  |
  = note: `#[warn(clippy::single_component_path_imports)]` on by default
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#single_component_path_imports

warning: 1 warning emitted
```
exercism/xrust,petertseng/exercism-rust,exercism/xrust,petertseng/exercism-rust,petertseng/exercism-rust