Changelog #197

#15527 respect #[allow(unused_braces)].

#15465 fix cargo handle logging in flycheck.

#15542 less once_cell, more std.

#15543 remove some allocations in borrowck.

#15544 shuffle some locking around.

#15549 add a few more db.unwind_if_cancelled() calls.

#15548 restructure some modules in the rust-analyzer crate.

#15551 move doc-comment handling into ide-db.

#15552 bump rustc-perf checkout for metrics, replace webrender, diesel and ripgrep with newer versions.

#15553 add hyper 0.14.18 to metrics.