Fix dockerVersion command creation

[mrfyda]

Fixes #1051

[muuki88]

Thanks for the quick fix ❤️

[muuki88]

@mrfyda are you interested in becoming more involved with sbt-native-packager?
I'm more than happy to have more people on board maintaining this project :)

[NeQuissimus]

@muuki88 Can you cut a release for this?

[muuki88]

I'll try ASAP when I'm back from work.

[NeQuissimus]

Thank you :)

[muuki88]

1.3.1 is out

[mrfyda]

@muuki88 Thanks for the release. Let me know how I can help.

[muuki88]

Sorry, lost track of your answer 😄
Any help is welcome. You are already contributing well done code contributions.
I'm giving you commit rights, so you could review and merge other peoples PRs
if you feel comfortable doing so and have the time and motivation to.

Even if this sounds obvious: Everything, yet so seemingly small help, is awesome,
but if you aren't forced to do anything. The native-packager community is small,
with friendly, helpful and open-minded people. It should always be enjoyable
contributing here 😃

If you like, we can hangout/skype 😄