support sparse array conversion

[Roger-luo]

fix #204

[codecov-commenter]

Codecov Report

Merging #918 (f04535a) into master (f77394b) will increase coverage by 0.35%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #918      +/-   ##
==========================================
+ Coverage   67.97%   68.33%   +0.35%     
==========================================
  Files          20       21       +1     
  Lines        2033     2021      -12     
==========================================
- Hits         1382     1381       -1     
+ Misses        651      640      -11     

Flag	Coverage Δ
unittests	68.33% <100.00%> (+0.35%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/conversions.jl	63.32% <ø> (ø)
src/scipy.jl	100.00% <100.00%> (ø)
src/PyCall.jl	70.39% <0.00%> (-0.31%)	:arrow_down:
src/startup.jl	53.12% <0.00%> (+4.06%)	:arrow_up:

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[Roger-luo]

Thanks for reviving this! I didn't notice the CI not passing