Automated versioning

the problem

Just yesterday I have built the release and have forgotten to update the version inside an golang app, which could possibly force users to clean browser cache to see last changes.

the solution

We are using version variable in makefile, and it is easy enough to change this on every release, we should pass it's value to go build, as I remember it is possible to initialize the string variable in go package with ldflags option -X. We should investigate possible solution for not to repeat the same error.