Fix issue that some DBFs don't have end of file marker
Fix issue that some DBFs don't have end of file marker

fixes #25

Co-Authored-By: Milan Dendis <ddc6c72fde4ded54c4ffe354e11a1b5854711ccf@users.noreply.github.com>

ekonbenefits/dotnetdbf,ekonbenefits/dotnetdbf