FileUtils.mv does not take a third options argument

[samg]

Standard lib FileUtils.mv takes an options hash as a third argument, FakeFS bombs on this:

With real FileUtils:

irb(main):005:0> FileUtils.mv '/tmp/foo', '/tmp/bar', :force => true
=> 0

With FakeFS

irb(main):006:0> FileUtils.mv '/tmp/foo', '/tmp/bar', :force => true
ArgumentError: wrong number of arguments (3 for 2)

http://ruby-doc.org/core/classes/FileUtils.html#M004330