Release v1.0.0 — re-release of 0.15.5 as stable

update CHANGELOG

update docstring (this time for sure!)

update CHANGELOG

finalize 0.15.1

0.15.0 release: remove "coming soon" notice

remove Python 3.4 from CI as it's no longer available

Update version number

Oops.

Version 0.14.1 "Retrofuturistic edition"

**Language version**:

- Support Python 3.6. First released in 2016, supported until 2021, most distros should have it by now.
- This will be the final release that supports Python 3.4; upstream support for 3.4 ended in March 2019.

**New**:

- ``Popper``, a pop-while iterator.
- ``window``, a length-n sliding window iterator for general iterables.
- ``autoref[]`` can now be nested.
- ``dbg[]`` now supports also an expression variant, customizable by lexically assigning ``dbgprint_expr``. See the README on macros for details.

**Bugfixes**:

- Fix crash when SymPy or mpmath are not installed.
- ``mogrify`` is now part of the public API, as it should have been all along.
- Docs: Mention the ``mg`` function in the README.

**Non-breaking changes**:

- Future-proof ``namelambda`` for Python 3.8.
- Docs: ``dbg[]`` is now listed as a convenience feature in the README.