adding condition for map_clone message

[kyoto7250]

This PR fixes the message about map_clone.

if msrv >= 1.36, the message is correct.

$ cat main.rs 
fn main() {
  let x: Vec<&i32> = vec![&1, &2];
  let y: Vec<_>  = x.iter().map(|i| *i).collect();
  println!("{:?}", y);
}

$ cargo clippy
warning: you are using an explicit closure for copying elements
 --> main.rs:3:20
  |
3 |   let y: Vec<_>  = x.iter().map(|i| *i).collect();
  |                    ^^^^^^^^^^^^^^^^^^^^ help: consider calling the dedicated `copied` method: `x.iter().copied()`
  |
  = note: `#[warn(clippy::map_clone)]` on by default
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#map_clone

warning: `test` (build script) generated 1 warning
warning: `test` (bin "test") generated 1 warning (1 duplicate)
    Finished dev [unoptimized + debuginfo] target(s) in 0.00s

but, if msrv < 1.36, the suggestion is cloned, but the message is copying.

$ cat clippy.toml 
msrv = "1.35"
 
$ cargo clippy
warning: you are using an explicit closure for copying elements
 --> main.rs:3:20
  |
3 |   let y: Vec<_>  = x.iter().map(|i| *i).collect();
  |                    ^^^^^^^^^^^^^^^^^^^^ help: consider calling the dedicated `cloned` method: `x.iter().cloned()`

I think the separation of messages will make it more user-friendly.

thank you in advance.

changelog: Fixed a message in map_clone.

[rust-highfive]

r? @llogiq

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[giraffate]

nits: Since it's the same as sugg_method, so it would be better to put them into one like this:

        let (message, sugg_method) = if is_copy && meets_msrv(self.msrv.as_ref(), &msrvs::ITERATOR_COPIED) {
            ("you are using an explicit closure for copying elements", "copied")
        } else {
            ("you are using an explicit closure for cloning elements", "cloned")
        };

[kyoto7250]

This way is more cooler.
Thank you!

[giraffate]

@bors r+

Thanks!

[bors]

📌 Commit 40224f4 has been approved by giraffate

[bors]

⌛ Testing commit 40224f4 with merge bc069ef...

[bors]

☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: giraffate
Pushing bc069ef to master...