Merge pull request swagger-api#2904 from swagger-api/prepare-release-…

…2.0.3

prepare release 2.0.3

Merge pull request swagger-api#2903 from swagger-api/prepare-release-…

…1.5.21

prepare release 1.5.21

Merge pull request swagger-api#2816 from swagger-api/prepare-release-…

…2.0.2

prepare release 2.0.2

Merge pull request swagger-api#2817 from swagger-api/prepare-release-…

…1.5.20

prepare release 1.5.20

Merge pull request swagger-api#2762 from swagger-api/prepare-release-…

…2.0.1

prepare release 2.0.1

Merge pull request swagger-api#2761 from swagger-api/prepare-release-…

…1.5.19

prepare release 1.5.19

Merge pull request swagger-api#2726 from swagger-api/prepare-release-…

…2.0.0

prepare release 2.0.0

Merge pull request swagger-api#2544 from swagger-api/prepare-rc3

prepare release candidate 2.0.0-rc3