File.write accepts a fourth optional argument
File.write accepts a fourth optional argument

Previous fake File.write did not accept the valid fourth argument
`open_args`.
This commit should provide a such possibility.
I do not certify correct behavior for all cases, but at least it won’t
raise a useless exception and will extends the fakers compatibility

1234-/fakefs,deployable/fakefs,bquorning/fakefs,fakefs/fakefs,marxarelli/fakefs,defunkt/fakefs