cholesky of BlockDiagonal(Diagonal)

[mzgubic]

Closes #109

[codecov]

Codecov Report

Merging #110 (7d0225b) into master (5f0dcca) will decrease coverage by 0.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #110      +/-   ##
==========================================
- Coverage   96.17%   95.98%   -0.19%     
==========================================
  Files           5        5              
  Lines         340      324      -16     
==========================================
- Hits          327      311      -16     
  Misses         13       13              

Impacted Files	Coverage Δ
src/linalg.jl	95.34% <100.00%> (-0.21%)	⬇️
src/blockdiagonal.jl	86.76% <0.00%> (-0.56%)	⬇️
src/base_maths.jl	100.00% <0.00%> (ø)

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[rofinn]

Seems reasonable to me. Just needs a version bump.