Meltdown exercise change according to issue #2565

[kbuc]

Changes:

• Change Task 2 intervals to cover non-integer comparison.
• Rewrite tests to test more points, especially the border cases.
• Reduce number of tests of only one per function, but test many points
  (asserts in loop) in each test.
• Remove hints of integer input parameters (they can be any numeric type).

[BethanyG]

@kbuc -- These are excellent changes. Thank you. 😄 I have one language suggestion (which is optional) and a request about tests/variations. Let me know if you have any questions or issues.

[BethanyG]

Oh! And I almost forgot (which is terrible) -- please add a contributors key to the config for this exercise, and then add yourself to the array. 😄 exercise config.json, so that you get credit for all the work you've done on this re-write. Here is the spec for that config.json file.

[BethanyG]

@IsaacG -- Please don't recommend anything from typing in concept exercises or concept exercise docstrings that don't have typing as a prerequisite. We don't want to confuse students or require an optional module for a concept exercise. Thanks!

[BethanyG]

Bumping this to large size given the back and forth with test cases and language. @kbuc -- many thanks for your patience with the process!