Respect force_save in savevalues!

[ChrisRackauckas]

Potential fix for #309

[codecov]

Codecov Report

Merging #310 (6daa364) into master (6cdf6b4) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #310      +/-   ##
==========================================
+ Coverage   24.66%   24.68%   +0.01%     
==========================================
  Files          23       23              
  Lines        5732     5732              
==========================================
+ Hits         1414     1415       +1     
+ Misses       4318     4317       -1     

Impacted Files	Coverage Δ
src/common_interface/integrator_utils.jl	67.01% <100.00%> (+1.03%)	⬆️

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