Revert "bump gemspec version to 3.0.0-rc1"
Revert "bump gemspec version to 3.0.0-rc1"

This reverts commit dfaf8150a4ab935a4f77db967f35285b73b35607.

leejarvis/slop,prees1/slop,rickhull/slop,brbrady/slop,NigoroJr/slop