Add StackMode to make stack traces configurable

[miketonks]

Adds StackMode as an optional parameter to Convey, in the same way that FailureMode is implemented.

StackMode can be Error (default - print stack only on errors) or Fail (print stack for failure and errors).

Fixes: Make stacktrace on error optional #566

[violin0622]

Thanks, this is exactly what I want.

[miketonks]

Any chance for someone to review this?

[miketonks]

Thanks @chrishili

What's next step. Any change to merge this and make a release?

[riannucci]

Hm... I'm not sure why this wasn't merged... If by any chance you're still using goconvey, can you confirm that this still works?

[ghost]

why this wasn't merged ?

[ezk84]

Have been using the StackMode fork for close to a year and hasn't been a problem for me, so please merge!

[riannucci]

Neat! I like it :)

[ezk84]

😱 I should have checked against the latest version of master when in fact I had been using a fork based off a version that was more than a year old. This is now leading to a compile error when running tests.

It's a single line change, so I submitted PR #633 to address it. Please merge and re-release 1.6.5.

[sstulio]

Can someone guide me on how to use it now? Where can I set the StackMode while running go test?

[miketonks]

Thanks @ezk84 @riannucci ❤️ 🥳

[miketonks]

@sstulio

	Convey("When foo ...", StackFail, func() {