SentenceTokenizer doesn't split by three dots symbol

[satyrius]

SentenceTokenizer doesn't split by this symbol …. Here is the example of the content.

const { SentenceTokenizerNew } = require('natural')
const content = `We’re heading for a catastrophic global temperature rise… Fires are blazing from the Amazon to the Arctic`
const tokenizer = new SentenceTokenizer()
tokenizer.tokenize(content) // returns one sentence, while two is expected

[Hugo-ter-Doest]

Solved in #687