Nicfit.py

--------------------

Fix
~~~
- Consume asyncio main_task exceptions.

--------------------

New
~~~
- `addCommandLineArgs` hide_args=bool argument to only show --help-logging.
- _HelpCommanMixin accepts COMMAND_INSTANCES map.

Changes
~~~~~~~
- Removed curio support.
- Register will only warn, rather than ValueError, for dup command names.

Fix
~~~
- Create lists from command aliases for concatenation.
- Test for dup commands no longer raises.

--------------------

New
~~~
- Pygments requirement for nicfit.shell.
- _HelpCommanMixin supports multiple `COMMAND_CLASSES` for loading help
commands.

Changes
~~~~~~~
- Nicfit.shell ported to prompt_toolkit 2.

Fix
~~~
- Use yaml.safe_load.

Other
~~~~~
- `make twine-check`

--------------------
- Security update for urllib3 from 1.24.1 to 1.25.3 (404) <github-botpyup.io>

--------------------

Fix
~~~
- Cookiecutter `year` vairable is now a string, and no longer a choice type
- Cookiecutter `py35` variable is again settable from .cookiecutter.yml

------------------------

Fix
~~~
- Release tag checks for `make pre-release`
- Fixed command API bugs exposed with python3.7.

Other
~~~~~
- Use correct yaml parser and version bump.
- More python version tested.
- Better pytest_cache clean, and formatting updates.