Move ATA dependency into a feature

[macalinao]

No description provided.

[codecov-commenter]

Codecov Report

Merging #32 (3912d7f) into master (26e4e6c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #32   +/-   ##
=======================================
  Coverage   80.00%   80.00%           
=======================================
  Files           4        4           
  Lines         130      130           
=======================================
  Hits          104      104           
  Misses         26       26           

Impacted Files	Coverage Δ
vipers/src/assert.rs	100.00% <ø> (ø)
vipers/src/lib.rs	80.00% <ø> (ø)

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