[2.0.4] Set version
[2.0.4] Set version

- Set release version to 2.0.4

samsonasik/zf2-documentation,akrabat/zf2-documentation,gennadiylitvinyuk/zf2-documentation,samsonasik/zf2-documentation,rettal/zf2-documentation,Rud5G/zf2-documentation,akrabat/zf2-documentation,Rud5G/zf2-documentation,rettal/zf2-documentation,gennadiylitvinyuk/zf2-documentation