Fixed invalid composer: no installation possible (because of ceus-media/doc-creator)

[k00ni]

Before that fix, running composer update lead to:

Your requirements could not be resolved to an installable set of packages.

Problem 1
    - Installation request for ceus-media/doc-creator dev-master -> satisfiable
by ceus-media/doc-creator[dev-master].
    - ceus-media/doc-creator dev-master requires ceus-media/common ^0.8 ->
satisfiable by ceus-media/common[0.8.1, 0.8.2, 0.8.2.1, 0.8.2.2, 0.8.2.3,
0.8.2.4, 0.8.2.5, 0.8.2.6, 0.8.2.7, 0.8.3, 0.8.3.1, 0.8.3.2, 0.8.3.3, 0.8.3.4,
0.8.3.5, 0.8.3.6, 0.8.3.7] but these conflict with your requirements or minimum-
stability.

[k00ni]

Closed due inactivity.