pythagorean-triplet: Updated the test suite to the version 1.0.0

[ZapAnton]

Updates the pythagorean-triplet according to the latest canonical-data.

The canonical-data introduced the sum input parameter, therefore the stub template is updated alongside with the test suite and the example solution.

Closes #712

[ZapAnton]

I may be reading the Travis logs wrong, but for some reason the exercise is checked four times. Should probably investigate this.

Edit: Indeed the git diff --name-only master | grep "exercises/" | cut -d '/' -f -2 | awk -v repo=$repo '{print repo"/"$1}' command returns something like this:

/exercises/pythagorean-triplet
/exercises/pythagorean-triplet
/exercises/pythagorean-triplet
/exercises/pythagorean-triplet

Probably worth an issue

[coriolinus]

Approve of the work done so far, but a little bit remains:

• remove "option" from exercise topics in config.json at

  rust/config.json

  Line 154 in 4704fa4

  "option"

I wanted to add "update README" to that list, but apparently the problem-specifications README is also out of date and misleading.

[coriolinus]

Ok, I think this looks good. Thanks for doing it!

I have not verified the tests against the canonical data, but they look reasonable.

I intend to merge this not later than Wednesday, assuming no objections from other maintainers. I do not object if other maintainers wish to merge sooner.

[petertseng]

I think I noticed something about the check. Let me know if I was wrong

[petertseng]

my comment appears to have disappeared. one second while I remake it.

[petertseng]

I think I noticed something about the check. Let me know if I was wrong

[petertseng]

makes sense!