Bake version into binaries to match release version

[dylan-smith]

When building the artifacts to publish a new release, we're not baking the version number (from the release/tag) into the binary. So when you do octoshift --version it will always show 1.0.0.

In old .net this would be done by updating the assemblyinfo.cs files, can't remember how it's done in .Net core.