Mass matrix hotfix

[MSeeker1340]

Address changes in SciML/DiffEqBase.jl#126.

I think the SDEProblem and SDEFunction interface can still use some improvements though. It doesn't really make sense to repeat the g field in both the problem and the function --- one should be enough.

[ChrisRackauckas]

I think the SDEProblem and SDEFunction interface can still use some improvements though. It doesn't really make sense to repeat the g field in both the problem and the function --- one should be enough.

Indeed. I just haven't worked through the whole thing yet.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@0dff9b9). Click here to learn what that means.
The diff coverage is 62.5%.

@@            Coverage Diff            @@
##             master      #93   +/-   ##
=========================================
  Coverage          ?   90.45%           
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  Files             ?       34           
  Lines             ?     1394           
  Branches          ?        0           
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  Hits              ?     1261           
  Misses            ?      133           
  Partials          ?        0

Impacted Files	Coverage Δ
src/caches/kencarp_caches.jl	100% <ø> (ø)
src/caches/basic_method_caches.jl	100% <ø> (ø)
src/perform_step/sdirk.jl	81.81% <0%> (ø)
src/perform_step/implicit_split_step.jl	58.33% <0%> (ø)
src/derivative_utils.jl	100% <100%> (ø)
src/algorithms.jl	100% <100%> (ø)
src/solve.jl	79.83% <50%> (ø)

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[ChrisRackauckas]

Looks like there was some issues with the local testing setup so I got this from here. Thanks!