changed w type in max matching

[matbesancon]

w is now an AbstractMatrix{T}

min_weight perfect matching could not be modified for the moment, heavier dependencies with BlossomV

[coveralls]

Coverage decreased (-1.8%) to 98.214% when pulling 039757c on matrix-weights into 8f64632 on master.

[codecov]

Codecov Report

Merging #5 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master     #5   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           4      4           
  Lines         105    113    +8     
=====================================
+ Hits          105    113    +8

Impacted Files	Coverage Δ
src/maximum_weight_matching.jl	100% <100%> (ø)	⬆️
src/lp.jl	100% <100%> (ø)	⬆️

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[coveralls]

Coverage decreased (-1.8%) to 98.214% when pulling 039757c on matrix-weights into 8f64632 on master.

[coveralls]

Coverage decreased (-0.9%) to 99.115% when pulling 36a0a73 on matrix-weights into 8f64632 on master.

[coveralls]

Coverage remained the same at 100.0% when pulling 0ec1e60 on matrix-weights into 8f64632 on master.