Install setuptools for publish action

Merge pull request #670 from python-eel/SW-drop-below-3.7

Drop support for python 3.6, which is EOL

Merge pull request #661 from python-eel/SW-bump-version

Bump version to 0.15.3

Merge pull request #573 from Sentinent/eel-routes-on-custom-app

Add eel routes to `Bottle` instances passed in to `eel.start`

Merge pull request #645 from python-eel/SW-bump-bottle

Bump bottle from v0.12.13 to v0.12.20

Merge pull request #628 from dstricks/v0.15.0

Bump to v0.15.0

Add shutdown_delay on the start() function parameter (#529)

* Add time_shutdown on README

* Add time_shutdown parameter

* Add warning show for incorrect value

- Change default if time_shutdown is not correct int or float
- Accept string if is a digit

* fix typo on README

* rename variable, stricter error checking

* Update __init__.py

fix flake8 warning
remplace shortcut `f` not stable on python3.6 by format

* Update README.md

fix typo

* Update __init__.py

I think the syntax of this multi-line string was not correct

Co-authored-by: Samuel Williams <[email protected]>
Co-authored-by: Chris Knott <[email protected]>

Merge pull request #382 from samuelhwilliams/v0.14.0

Bump to v0.14.0

Bump to v0.13.2

Bump to v0.13.1