Update pangram.json

[istepura]

Based on exercism/fsharp#195. Test for edge case when panagram is not in target alphabet

[kytrinyx]

@petertseng @IanWhitney @ErikSchierboom you are the most likely to have opinions about this, I think.

[petertseng]

I feel more strongly about "the commits should be squashed before merge" than whether the test should be added.

But I would support the test to be added, since it looks to be the same as that added in https://github.com/exercism/xfsharp/pull/195/files and the reasoning for it seems sound. I assume there are solutions that pass "7h3 qu1ck brown fox jumps ov3r 7h3 lazy dog" but fail the new test? (Possibly because they remove numbers?)

[ErikSchierboom]

@petertseng Did you know that you can now squash the commits in the PR from within the GitHub interface? See this article.

@kytrinyx I think this is a good addition.

[tejasbubane]

Should we create issues in all language repos using blazon?

[Insti]

@tejasbubane that seems excessive for a minor test case addition.

[tejasbubane]

@Insti Agreed. 👍 This is an edge case anyways.