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

Prepare for 0.4.21 release

Merge pull request rust-lang#574 from chrysn-pull-requests/doc-log-to…

…-defmt

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

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

Prepare for 0.4.19 release

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

Prepare for 0.4.18 release

Merge pull request rust-lang#508 from KodrAus/cargo/0.4.17

Prepare for 0.4.17 release

Merge pull request rust-lang#492 from rust-lang/KodrAus-patch-2

Update changelog for 0.4.15 with last minute additions

Prepare for.0.4.14 release (rust-lang#447)

* prepare for.0.4.14 release

* update based on value-bag API

* rename to_error to to_borrowed_error

* note method name change in changelog

* update to released value-bag

Merge pull request rust-lang#441 from KodrAus/0.4.11-patch

Prepare for 0.4.13 release patch

Merge pull request rust-lang#429 from KodrAus/cargo/0.4.12

Prepare for 0.4.12 release

Merge pull request rust-lang#404 from KodrAus/cargo/0.4.11

Prepare for 0.4.11 release