Improve Application Versioning

[kcajmagic]

This will allow for better bug reports and information the binary running.
For example if you build a docker image with make local-docker you can get the version with the command docker run --rm xmidt/svalinn:local -v.

svalinn:
  version:      0.12.0+local
  go version:   go1.12.1
  built time:   2019-10-08 22:24:14
  git commit:   2b26b52
  os/arch:      linux/amd64

[codecov-io]

Codecov Report

Merging #111 into master will decrease coverage by 0.88%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master    #111      +/-   ##
=========================================
- Coverage   47.98%   47.1%   -0.89%     
=========================================
  Files           6       6              
  Lines         373     380       +7     
=========================================
  Hits          179     179              
- Misses        189     196       +7     
  Partials        5       5

Impacted Files	Coverage Δ
main.go	0% <0%> (ø)	⬆️

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[kristinapathak]

Looks good!