Stop Byebug after continue

[k0kubun]

Fixes #61

To optimize performance, I want to stop Byebug after exiting Pry's REPL.
This change must be shipped with deivid-rodriguez/byebug#160. So dependency of byebug should be updated after the pull request is merged.

With deivid-rodriguez/byebug#160, this worked fine in my rails application and it became faster.

[k0kubun]

We can't pass tests without deivid-rodriguez/byebug#160 in byebug.

[deivid-rodriguez]

@k0kubun Thre's a couple of extra breaking changes in 7.0.

• at_return now receives a parameter which is the return value of the method.
• When attaching to the debugger, you might need to switch the step_out call and pass 4 steps instead of 3, because returns from c-methods are now taken into account too.

Hope it helps!

[k0kubun]

Thanks for your advice!

[deivid-rodriguez]

Here you go, rebase and it should be fine!

[k0kubun]

Thank you for your quick work! Rebased and Travis CI passed except for Ruby 2.0.

[deivid-rodriguez]

I see, the error in 2.0 is that same as deivid-rodriguez/byebug#183. The quick way I see of fixing it requires yet another breaking change. Too many breaking changes but I'm not going to think about it too much.

Hold on.

[deivid-rodriguez]

Ok rebase now.

[k0kubun]

Rebased and passing all tests now.