Version bump to 0.3.0.
Allow using .local/share/ruby-advisory-db if it exists.
Fixed a syntax error that caused vim-ruby to segfault. O.o
Added Database.update!
Added an update task.
Add gems/ to the Database path in each_advisory_path/each_advisory_path_for.
Let git handle printing the error.
Converted Database::PATH to Database.path.
Simplified.
Merge remote-tracking branch 'upstream/0.3.0'