Call to undefined method Prophecy\Argument::in()

[tyteen4a03]

Unlike other functions in Argument, in() and notIn() are not static methods, causing an error when trying to call it statically.

It should be changed to static to be in line with other methods.

[stof]

this is indeed a mistake.

Can you send a PR doing the change ?

[tyteen4a03]

@stof I have no problem doing a PR but I'm just wondering if this would constitute an API breaking change? (I can also keep both in and deprecate the non-static one.)

[ciaranmcnulty]

We've only ever documented static calls and it's clearly an error so I'd count it as a bug fix