Hi,

Whilst working on the Reproducible Builds effort [0], we noticed that
ruby-timers could not be built reproducibly.

This is because the .gemspec file gets evaluated, causing this line:

  File.expand_path("~/.gem/release.pem")

... to be rendered in the binary package, leading to the package
embedding the build user's home directory.

Patch attached.

 [0] https://reproducible-builds.org/


Regards,