Log message:
Add ruby-timers package version 4.0.1.

Ruby timer collections. Schedule several procs to fire after configurable
delays or at periodic intervals.

This gem is especially useful when you are faced with an API that accepts a
single timeout but you want to run multiple timers on top of it. An example of
such a library is [nio4r](https://github.com/celluloid/nio4r), a
cross-platform Ruby library for using system calls like epoll and kqueue.