Fix warning in Ruby 1.9
Fix warning in Ruby 1.9

I'm not sure if it happens in other versions, but I saw this when
installing the gem:

unable to convert "\xE2" to UTF-8 in conversion from ASCII-8BIT to UTF-8
to US-ASCII for lib/minfraud/components/addressable.rb, skipping

kushniryb/minfraud-api-v2,kushniryb/minfraud-api-v2