docs: changelog for 2.5.9
docs: changelog for 2.5.9

soyuka/core,soyuka/core,api-platform/core,meyerbaptiste/core,vincentchalamon/core,meyerbaptiste/core,soyuka/core,api-platform/core,vincentchalamon/core,vincentchalamon/core,api-platform/core,vincentchalamon/core,meyerbaptiste/core,meyerbaptiste/core,soyuka/core,api-platform/core