Bitstring

Another maintenance release.

* Fixed a couple of outdated results in the readme (Issue 214).
* Some more documentation tidying.
* Turned off some debug code by default.
* Fixed a couple of failing tests in different Python versions.
* Fix for consistent pos initialisation semantics for different types.
* Change to allow wheels to be uploaded to PyPI.
* More work for LSB0 mode, but still not finished or documented (sorry).

May 5th 2020: version 3.1.7 released
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This is a maintenance release with a few bug fixes plus an experimental
feature to allow bits to be indexed in the opposite direction.

* Fixing del not working correctly when stop value negative (Issue 201)
* Removed deprecated direct import of ABC from collections module (Issue 196)
* Tested and added explicit support for Python 3.7 and 3.8. (Issue 193)
* Fixing a few stale links to documentation. (Issue 194)
* Allowing initialisation with an io.BytesIO object. (Issue 189)

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July 9th 2019: version 3.1.6 released
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A long overdue maintenace release with some fixes.

* Fixed immutability bug. Bug 176.
* Fixed failure of `__contains__` in some circumstances. Bug 180.
* Better handling of open files. Bug 186.
* Better Python 2/3 check.
* Making unit tests easier to run.
* Allowing length of 1 to be specified for bools. (Thanks to LemonPi)

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May 17th 2016: version 3.1.5 released
- Support initialisation from an array.
- Added a separate LICENSE file.

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March 19th 2016: version 3.1.4 released

This is another bug fix release.
- Fix for bitstring types when created directly from other bitstring types.
- Updating contact, website details.

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March 4th 2014: version 3.1.3 released

This is another bug fix release.
- Fix for problem with prepend for bitstrings with byte offsets in their data store.