bump rustc-ap crates to v677#4411

Merged

calebcartwright merged 7 commits intorust-lang:rustfmt-1.4.21from

calebcartwright:rustfmt-1.4.21

Sep 5, 2020

Commits on Sep 3, 2020

fix: inner attribute formatting
calebcartwright
committed

Commits on Sep 4, 2020

bump rustfmt version to v1.4.21
calebcartwright
committed