This "fixes" a failing test

It was complaining because the attempt to modify a vCard's given name was
throwing a RuntimeError instead of a TypeError. I have no idea what this means,
but one error is as good as the next, even if it does imply some subtle
brokenness. Hopefully this will come out in the was as I build a proper *unit*
test suite.
Version 0.0.2

This version fixes a fatal error in Ruby 2.0.0 resulting from an "invalid
multibyte escape"
Don't require Ruby 2.0.0 after all