Add feature for showing error locations

[macalinao]

No description provided.

[codecov-commenter]

Codecov Report

Merging #48 (a9f4204) into master (454047b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #48   +/-   ##
=======================================
  Coverage   81.97%   81.97%           
=======================================
  Files           5        5           
  Lines         172      172           
=======================================
  Hits          141      141           
  Misses         31       31           

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

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