Ignore dotfiles only while discovering magic files
Ignore dotfiles only while discovering magic files

Some programs (which?) might create temporary files like `~name` or
`_name`, but maybe there are people who actually rely on names like
`_name`. Let's restrict the filter to just dotfiles for now.

chubbymaggie/binwalk,devttys0/binwalk,devttys0/binwalk,pombredanne/binwalk,sundhaug92/binwalk,pombredanne/binwalk,cappiewu/binwalk,chubbymaggie/binwalk,cappiewu/binwalk,itsens/binwalk,sundhaug92/binwalk,itsens/binwalk