Add a changelog

CHANGELOG.md

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+## Version 1.5.1 (2016-08-19)
+
+- Bug fix: Made it possible to load the Japanese or Korean dictionary when the
+  other one is not available
+
+
+## Version 1.5.0 (2016-08-08)
+
+- Include word frequencies learned from the Common Crawl
+- Support Bulgarian, Catalan, Danish, Finnish, Hebrew, Hindi, Hungarian,
+  Norwegian Bokmål, and Romanian
+- Improve Korean with MeCab tokenization
+- New frequency-merging strategy (weighted median)
+- Include Wikipedia as a Chinese source (mostly Traditional)
+- Include Reddit as a Spanish source
+- Remove Greek Twitter because its data is poorly language-detected
+- Add large lists in Arabic, Dutch, Italian
+- Remove marks from more languages
+- Deal with commas and cedillas in Turkish and Romanian
+- Fix tokenization of Southeast and South Asian scripts
+- Clean up Git history by removing unused large files
+
+[Announcement blog post](https://blog.conceptnet.io/2016/08/22/wordfreq-1-5-more-data-more-languages-more-accuracy)
+
+
+## Version 1.4 (2016-06-02)
+
+- Add large lists in English, German, Spanish, French, and Portuguese
+- Add `zipf_frequency` function
+
+[Announcement blog post](https://blog.conceptnet.io/2016/06/02/wordfreq-1-4-more-words-plus-word-frequencies-from-reddit/)
+
+
+## Version 1.3 (2016-01-14)
+
+- Add Reddit comments as an English source
+
+
+## Version 1.2 (2015-10-29)
+
+- Add SUBTLEX data
+- Better support for Chinese, using Jieba for tokenization, and mapping
+  Traditional Chinese characters to Simplified
+- Improve Greek
+- Add Polish, Swedish, and Turkish
+- Tokenizer can optionally preserve punctuation
+- Detect when sources stripped "'t" off of English words, and repair their
+  frequencies
+
+[Announcement blog post](https://blog.luminoso.com/2015/10/29/wordfreq-1-2-is-better-at-chinese-english-greek-polish-swedish-and-turkish/)
+
+
+## Version 1.1 (2015-08-25)
+
+- Use the 'regex' package to implement Unicode tokenization that's mostly
+  consistent across languages
+- Use NFKC normalization in Japanese and Arabic
+
+
+## Version 1.0 (2015-07-28)
+
+- Create compact word frequency lists in English, Arabic, German, Spanish,
+  French, Indonesian, Japanese, Malay, Dutch, Portuguese, and Russian
+- Marginal support for Greek, Korean, Chinese
+- Fresh start, dropping compatibility with wordfreq 0.x and its unreasonably
+  large downloads
+