future workflow improvement

[kambala-decapitator]

alternatively, we could make VCMI a downstream job of deps job - less manual work

vcmi-dependencies/README.md

Lines 56 to 60 in c295203

	- open PR in vcmi/vcmi repository that bumps submodule to newest revision of this repository and whatever changes need to be done to source code to use newer package (if any)
	After merging PR in vcmi/vcmi repository vcmi will use new dependencies.
	If vcmi/vcmi PR is discarded for one reason or another, changes in this repository will have to be discarded as well