word-count: example implementation doesn't handle words with apostrophes

[jackattack24]

I updated the tests for word-count in PR #1044. However, the following two tests from the canonical data both failed with the example implementation:

    {
      "description": "with apostrophes",
      "property": "countwords",
      "input": "First: don't laugh. Then: don't cry.",
      "expected": {
        "first": 1,
        "don't": 2,
        "laugh": 1,
        "then": 1,
        "cry": 1
      }
    },
    {
      "description": "with quotations",
      "property": "countwords",
      "input": "Joe can't tell between 'large' and large.",
      "expected": {
        "joe": 1,
        "can't": 1,
        "tell": 1,
        "between": 1,
        "large": 2,
        "and": 1
      }
    }

"don't" ended up getting split into "don" and "t" which were counted as seperate words, and the same happened with "can't".

[N-Parsons]

Thanks for raising this, @jackattack24. I've submitted a PR that resolves this.