update markdown content layout

refresh repository description

update metadata structure auto

fix auto title sync

update title markdown style

changelog

more robust Nocedal-Wright line search

update copyright year

Merge branch 'master' of https://github.com/yixuan/LBFGSpp

changelog

add LineSearchMoreThuente to comparison

unified API of line search class

make the `param` argument generic

additional sanity check

typo