feat: check for updates in starter

[ankithans]

Closes #138

Description

• In Starter template https://github.com/aerogear/charmil-starter/pull/5
• Check for updates in starter

confusion in (devel); while doing

if info, ok := debug.ReadBuildInfo(); ok {
    fmt.Println(info.Main.Version) // it prints (devel)
}

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation change
• [ ] Other (please specify)

Checklist

• [ ] Documentation added for the feature
• [x] CI and all relevant tests are passing
• [ ] Code Review completed
• [ ] Verified independently by reviewer

[wtrocki]

Why we are doing this particular problem?

[ankithans]

This is to prompt the user, if any update is available.

eg.

[wtrocki]

I get that - but why this is priority :D

[wtrocki]

Anyway.. let's get that over since it is done and move to more interesting things