* Relax dependency requirements by removing the upper version number bounds.
5.2.0
-------------------
* Cross compatibility for both Python 2 and 3. Linguistica 5 works on Python 2.7, 3.4, 3.5, and 3.6. (The GUI works on Python 3 only.)
* Travis CI was greatly simplified.
* Minor stylistic fixes. `flake8` checks for code quality (and is part of Travis CI).
5.1.1
-------------------
* Switch from the removed `QtWebKitWidgets` to `QtWebEngineWidgets` in the GUI code. (`QtWebKitWidgets` was deprecated in Qt 5.5 and removed in Qt 5.6.)
* `linguistica` is now a terminal command for launching the command line interface or the graphical user interface.
5.1.0
-------------------
* The major modules now available: - `lexicon` - `ngram` - `signature` - `manifold` - `trie` - `phon`
* Include graphical user interface (GUI) and command line interface (CLI)