submodules: update clippy from 20da8f45 to 71be6f62

Changes:
````
rustup https://github.com/rust-lang/rust/pull/57428/
Remove `to_string()`s from CompilerLintFunctions
Fix comment grammar
Fix .map(..).unwrap_or_else(..) bad suggestion
add suggestions for print/write with newline lint
````
This commit is contained in:
Matthias Krüger
2019-06-06 12:56:26 +02:00
parent daf1ed0e98
commit d68f0e1ef6