Merge pull request #670 from rust-lang/cargo/0.4.26

Prepare for 0.4.26 release

Merge pull request #663 from rust-lang/cargo/0.4.25

Prepare for 0.4.25 release

Merge pull request #660 from rust-lang/cargo/0.4.24

Prepare for 0.4.24 release

Merge pull request #656 from rust-lang/cargo/0.4.23

Prepare for 0.4.23 release

Merge pull request #634 from rust-lang/cargo/0.4.22

Prepare for 0.4.22 release

Merge pull request #617 from rust-lang/cargo/0.4.21

Prepare for 0.4.21 release

Merge pull request #574 from chrysn-pull-requests/doc-log-to-defmt

doc: Add log-to-defmt to other-facilities section

Merge pull request #552 from rust-lang/cargo/0.4.18

Prepare for 0.4.19 release

Merge pull request #566 from rust-lang/cargo/0.4.18-patch

Prepare for 0.4.18 release

Merge pull request #508 from KodrAus/cargo/0.4.17

Prepare for 0.4.17 release