Change save_start to take saveat into consideration

[Vaibhavdixit02]

No description provided.

[coveralls]

Coverage increased (+20.9%) to 77.979% when pulling 4781132 on Vaibhavdixit02:save_start into e847866 on JuliaDiffEq:master.

[codecov]

Codecov Report

Merging #89 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #89      +/-   ##
==========================================
+ Coverage   77.95%   77.97%   +0.02%     
==========================================
  Files          39       39              
  Lines        3928     3928              
==========================================
+ Hits         3062     3063       +1     
+ Misses        866      865       -1

Impacted Files	Coverage Δ
src/solve.jl	88.63% <ø> (ø)	⬆️
src/integrators/integrator_interface.jl	48.18% <0%> (+0.51%)	⬆️

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[ChrisRackauckas]

FunctionMap is only an algorithm in OrdinaryDiffEq.jl.