imports: remove unnecessary import

src/git.rs

@@ -15,7 +15,6 @@ use std::fmt::{self, Display};
 use std::io;
 use std::path::{Path, PathBuf};
 use std::process::{Command, Stdio};
-use std::result::Result;
 
 /// The Git object id of a commit.
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]

src/prepare.rs

@@ -23,7 +23,6 @@ use std::iter;
 use std::marker::PhantomData;
 use std::path::{Path, PathBuf};
 use std::process::{Command, Stdio};
-use std::result::Result;
 
 /// Steps which are involved in the submodule preparation process.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]