SublimeText: ignore new Package Control certs

Package Control now has a number of bundles for certificates instead
of the old directory. This ignores them as per

http://github.com/wbond/package_control/issues/1153
https://forum.sublimetext.com/t/generating-oscrypto-ca-bundle-crt-after-mac-os-install-and-security/23020

from the author