Moving version from variable to text file

[surajnarwade]

Resolves #712 , As it is needed for fabric8-maven-plugin

[kompose-bot]

@surajnarwade, thank you for the pull request! We'll ping some people to review your PR. @cdrage and @kadel, please review this.

[surajnarwade]

cc: @surajssd for review

[cdrage]

@surajnarwade

I really don't like this and this over-complicates things.

What happens if someone's developing in a different path?

What happens if someone doesn't have the source code?

What if GOPATH isn't set (they're just using Kompose on a production machine?)

You're also not checking to see if this errors out:

version, _ := ioutil.ReadFile(path)

Let's not modify version.go and only add VERSION to /build, we can modify the release.sh script to make the variable substitution of build/VERSION. But let's keep version.go as it is since this PR over-complicates gathering the version information when it could simply be a const variable.

[surajnarwade]

@cdrage got it, made changes accordingly

[cdrage]

LGTM