Exercise Pangram should define which alphabet is expected

[cjschneider2]

While doing this exercise I've noticed that the README.md does not mention which alphabet one should be checking against. I originally assumed an English alphabet, yet the last test in German being considered a pangram made me reconsider. I guess in summary the alphabet / language to be tested against should be defined exercise problem description, otherwise this is a rather unbounded problem.

[cjschneider2]

I can put up a pull request that fixes it, I just wanted other people's opinion on the matter.

[IanWhitney]

Clarification of the readme would certainly be useful. In the case of this exercise it's only looking for ascii characters. Nothing in extended ascii (or unicode, etc.) should count.

The edge case that the German test is trying to cover is that non-ascii characters don't blow up your code. It does contain a full ascii pangram once you filter out all of the extended characters.

[kotp]

exercism/problem-specifications#284 hopefully clarifies this.