Merge pull request #33 from tomitomi3/feature/#32 add numerical hessian #32

set ver 1.13.0 

add note for nuget 

release LibOptimization 1.12.2 

bugfix iteration count.(thanks fraschfn) 

整理 

update build dll 

Update README.md 

Update README.md 

Merge branch 'master' of https://github.com/tomitomi3/LibOptimization