Update 'Gemfile.lock'

Signed-off-by: Jussi Virtanen <jussi.k.virtanen@gmail.com>
Fix segmentation fault in 'pstore cat'

Terminate 'pstore cat' on an invalid input file.

Signed-off-by: Jussi Virtanen <jussi.k.virtanen@gmail.com>
Merge branch 'fixes/segmentation-fault-in-pstore-cat' of git://github.com/jvirtanen/pstore