Release `cargo-contract` v0.15.0 and `contract-metadata` v0.4.0 (use-…

…ink#351)

* Update changelog

* Bump version for `cargo-contract`

* Bump version for `contract-metadata`

* Bump version for `contract-metadata`

* Update changelog

* Update changelog

Release v0.14.0 (use-ink#327)

* Add log output

* Add use-ink#326 to changelog

* Bump version

* Fix changelog

Release v0.13.1 (use-ink#320)

Release 0.13.0 (use-ink#308)

* Bump version

* Fix release date

* Update changelog

Release 0.12.1 (use-ink#278)

* Update changelog

* Bump version

Release 0.12.0 (use-ink#267)

* Update changelog

* Bump version

* Add use-ink#260 to changelog

Release 0.11.1 (use-ink#249)

* Update changelog

* Bump version

Release 0.11.0 (use-ink#246)

* Bump versions

* Update changelog

* Apply suggestions from code review

Co-authored-by: Andrew Jones <[email protected]>

* Remove empty section

Co-authored-by: Andrew Jones <[email protected]>

Release 0.10.0 (use-ink#208)

* Update CHANGELOG.md

* Bump version

* Fix changelog link

Release 0.9.1 (use-ink#200)

* Bump version

* Update changelog

* Remove empty section from changelog