clean: remove snap support

[caarlos0]

closes #274

[codecov-io]

Codecov Report

Merging #276 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #276   +/-   ##
=======================================
  Coverage   78.94%   78.94%           
=======================================
  Files          12       12           
  Lines         266      266           
=======================================
  Hits          210      210           
  Misses         51       51           
  Partials        5        5

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