Added 'dot' and 'dot-upper' transformers

[adenix]

No description provided.

[codecov-commenter]

Codecov Report

Merging #61 (7e279f0) into master (aa45c0d) will decrease coverage by 0.84%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #61      +/-   ##
==========================================
- Coverage   66.23%   65.39%   -0.85%     
==========================================
  Files           4        4              
  Lines         465      471       +6     
==========================================
  Hits          308      308              
- Misses        146      152       +6     
  Partials       11       11              

Impacted Files	Coverage Δ
stringer.go	60.14% <0.00%> (-0.90%)	⬇️

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[tomarrell]

This would actually be exactly what we need. Is there any motivation to merge this PR @dmarkham?