cauchy 0.3.0, num-complex 0.3.1, rand 0.7.3

[termoshtt]

Revival of #176

[termoshtt]

Require to update lapack to use num-complex 0.3
blas-lapack-rs/lapack#25

[termoshtt]

Use rand 0.7 until num-complex supports rand 0.8.

[codecov]

Codecov Report

Merging #260 (4fa1b2b) into master (24bef8f) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #260   +/-   ##
=======================================
  Coverage   89.10%   89.10%           
=======================================
  Files          71       71           
  Lines        3578     3578           
=======================================
  Hits         3188     3188           
  Misses        390      390           

Impacted Files	Coverage Δ
ndarray-linalg/tests/opnorm.rs	100.00% <ø> (ø)
ndarray-linalg/tests/vector.rs	100.00% <ø> (ø)
ndarray-linalg/src/cholesky.rs	97.18% <100.00%> (ø)
ndarray-linalg/src/solve.rs	72.22% <100.00%> (ø)
ndarray-linalg/src/solveh.rs	72.72% <100.00%> (ø)
ndarray-linalg/tests/det.rs	100.00% <100.00%> (ø)

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