fix: Fix double negative in error message (#822)

This error is confusing to users, and required rewording for clarity.

src/utils/vcs.rs

@@ -486,7 +486,7 @@ pub fn get_commits_from_git<'a>(
  // If there is a previous commit but cannot find it in git history, throw an error.
  if !found {
  return Err(format_err!(
- "Couldn’t not find the SHA of the previous release in the git history. Increase your git clone depth.",
+ "Could not find the SHA of the previous release in the git history. Increase your git clone depth.",
  ));
  }
  let prev = result.pop();