feat: add summary counter failed/passed/skipped tests

[jeremybaumont]

Refers to #32

Why

The only 2 things that we would like to add to go test output were colors, that is solved with gotest project and a one line summary to count tests passed, skipped and/or failed. The later helps us with our TDD loop.

What

• Add one line summary at the end of the output to cound tests that failed, passed and/or skipped like the following:
  

[subtlepseudonym]

I believe this is beyond the scope of gotest. You could add the summary line with a bash script