word-count: check counting of empty words

[tehsphinx]

Ran across the following solution on the go track that will count empty words on some inputs:

package wordcount

import (
	"strings"
	"unicode"
)

// Frequency is the structure of words frequency
type Frequency map[string]int

// WordCount counts the occurrences of each word in a given phrase
func WordCount(input string) Frequency {
	counter := Frequency{}
	phrase := strings.FieldsFunc(input, split)

	for _, word := range phrase {
		word = normalize(word)
		counter[word]++
	}

	return counter
}

func normalize(word string) string {
	word = strings.ToLower(word)

	return strings.TrimFunc(word, func(r rune) bool {
		return !unicode.IsLetter(r) && !unicode.IsNumber(r)
	})
}

func split(r rune) bool {
	return r == ' ' || r == ','
}

The added test catches that behaviour.

[rpottsoh]

Unrelated change at end of file also need to update "version", see Travis CI output.

[rpottsoh]

also need to update "version", see Travis CI output.

See https://github.com/exercism/problem-specifications#test-data-versioning