3.0.0-alpha.26.1

Review some change log structure

3.0.0-alpha.25.2

Update changelog

Add migration guide

3.0.0-alpha.24.1

3.0.0-alpha.24

Merge pull request strapi#2786 from strapi/3.0.0-alpha.23.1

3.0.0-alpha.23.1

3.0.0-alpha.23

Merge branch 'master' of github.com:strapi/strapi into 3.0.0-alpha.22