prepare v1.4.31 release#4623

Merged

calebcartwright merged 10 commits intorust-lang:rustfmt-1.4.31from

calebcartwright:1.4.31

Jan 9, 2021

Commits on Jan 3, 2021

ci: fix linking issue on windows gnu jobs
calebcartwright
committed
Add support for edition 2021.

m-ou-se
authored and
calebcartwright
committed
Fixes for new rustc changes.

m-ou-se
authored and
calebcartwright
committed
Bump rustc-ap to v697.

m-ou-se
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calebcartwright
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Account for new ast::GenericParamKind::Const::default in rust_ast.

m-ou-se
authored and
calebcartwright
committed
Fix expected macro formatting test output.

m-ou-se
authored and
calebcartwright
committed
Add 2021 test.

m-ou-se
authored and
calebcartwright
committed
Update Cargo.lock.

m-ou-se
authored and
calebcartwright
committed

Commits on Jan 9, 2021