deprecate crate failure in favor of thiserror

[collinc97]

fixes #69

[howardwu]

SGTM pending CI

[codecov]

Codecov Report

Merging #85 into master will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #85      +/-   ##
==========================================
+ Coverage   88.94%   88.96%   +0.01%     
==========================================
  Files         231      229       -2     
  Lines       14161    14396     +235     
==========================================
+ Hits        12596    12807     +211     
- Misses       1565     1589      +24     

Impacted Files	Coverage Δ
errors/src/algorithms/commitment.rs	0.00% <0.00%> (ø)
errors/src/algorithms/crh.rs	0.00% <0.00%> (ø)
errors/src/algorithms/merkle.rs	0.00% <0.00%> (ø)
errors/src/algorithms/prf.rs	0.00% <0.00%> (ø)
errors/src/algorithms/signature.rs	0.00% <0.00%> (ø)
errors/src/algorithms/snark.rs	0.00% <0.00%> (ø)
errors/src/consensus/consensus.rs	0.00% <0.00%> (ø)
errors/src/curves/constraint_field.rs	0.00% <0.00%> (ø)
errors/src/dpc/binding_signature.rs	0.00% <0.00%> (ø)
errors/src/dpc/dpc.rs	0.00% <0.00%> (ø)
... and 42 more

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