Tldextract

* Features
* Prefer to cache in XDG cache directory in user folder, vs. in Python install folder ([213](https://github.com/john-kurkowski/tldextract/issues/213))
* Bugfixes
* Fix `AttributeError` on `--update` ([215](https://github.com/john-kurkowski/tldextract/issues/215))

* Bugfixes
* Catch permission error when making cache dir, as well as cache file ([211](https://github.com/john-kurkowski/tldextract/issues/211))

* Bugfixes
* Fix `tlds` property `AttributeError` ([210](https://github.com/john-kurkowski/tldextract/issues/210))
* Allow `include_psl_private_domains` in global `extract` too ([210](https://github.com/john-kurkowski/tldextract/issues/210))

No changes since 3.0.0.rc1.

This release fixes the long standing bug that public and private suffixes were
generated separately and could not be switched at runtime,
[66](https://github.com/john-kurkowski/tldextract/issues/66).

* Breaking Changes
* Rename `cache_file` to `cache_dir` as it is no longer a single file but a directory ([207](https://github.com/john-kurkowski/tldextract/issues/207))
* Rename CLI arg also, from `--cache_file` to `--cache_dir`
* Remove Python 2.7 support
* Features
* Can pass `include_psl_private_domains` on call, not only on construction
* Use filelocking to support multi-processing and multithreading environments
* Bugfixes
* Select public or private suffixes at runtime ([66](https://github.com/john-kurkowski/tldextract/issues/66))
* Removals
* Do not `debug` log the diff during update

* Bugfixes
* Fix concurrent access to cache file when using tldextract in multiple threads ([146](https://github.com/john-kurkowski/tldextract/pull/146))
* Relocate version number, to avoid costly imports ([187](https://github.com/john-kurkowski/tldextract/pull/187))
* Catch `IndexError` caused by upstream punycode bug ([200](https://github.com/john-kurkowski/tldextract/pull/200))
* Drop support for EOL Python 3.4 ([186](https://github.com/john-kurkowski/tldextract/pull/186))
* Explain warning better