v3.3.3, 2014-06-16 -- Initial release (based in `isbntools 3.3.3)`.
v3.3.4, 2014-06-16 -- Fix small bug with wheel package (based in `isbntools 3.3.3)`.
v3.3.5, 2014-06-22 -- Fix bug in 'notisbn' (based in `isbntools 3.3.4)`.
v3.3.6, 2014-06-30 -- Small improvements and optional ShelveCache.
v3.3.7, 2014-07-07 -- Fix issue #2, better debug logging and expose top exceptions.
v3.3.8, 2014-07-07 -- Fix wrong logging identifier.
v3.3.9, 2014-07-13 -- Mark as not valid ISBN-13 in series not allocated yet.
v3.4.1, 2014-07-16 -- Fix bug #7 and small improvements on the API.
v3.4.2, 2014-08-13 -- Add `doi2tex` and updated data.
v3.4.3, 2015-01-13 -- Better LOOSE regex and allow 'x' in canonical.
v3.4.4, 2015-01-26 -- Helpers sprint and fake_isbn.
v3.4.5, 2015-02-05 -- Better yield for openl and better log model.
v3.4.6, 2015-02-05 -- Fix bug #13.
v3.4.7, 2015-02-11 -- Fix bug #14.
v3.4.8, 2015-02-25 -- Fix bug #16, add 'desc' and 'cover' features.
v3.4.9, 2015-02-27 -- Fix issue #17 and bug #18, data range 20150227.
v3.5.1, 2015-03-10 -- New CoversCache and better unicode printing in Windows.
v3.5.2, 2015-03-15 -- Fix bug #19, relative paths on coverscache and data range 20150310.
v3.5.3, 2015-03-26 -- Add throttling for web services, data range 20150325 and 'in memory' keys cache.
v3.5.4, 2015-04-10 -- Issue #20, fix bugs #21 and #22 and data range 20150401. 
v3.5.5, 2015-04-22 -- Add logging to vias, fix bug #23, and data range 20150422.
v3.5.6, 2015-06-03 -- Deprecated 'bouth23' and data range 20150603. 
