Extends the python module toml with the python library fstring

See the test-files for some examples

you can do things like:

base_url="https://example.com"

[module1]
url="{base_url}/path1.html"

[module2]
url="{base_url}/path2.html"

... and many things more

Prerequisites for pyenv according to https://github.com/pyenv/pyenv/wiki/Common-build-problems

sudo apt-get install -y build-essential libssl-dev zlib1g-dev libbz2-dev \
libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev \
xz-utils tk-dev libffi-dev liblzma-dev python-openssl git

To prepare tox for the tests, install pyenv and install all needed python versions. e.g.:

echo pypy-5.7.1 2.7.18 3.5.9 3.6.11 3.7.8 3.8.5|xargs -n1 pyenv install
pyenv global pypy-5.7.1 2.7.18 3.5.9 3.6.11 3.7.8 3.8.5

then run tox:

tox

... syntax check:

flake8

and codecoverage:

tox
firefox htmlcov/index.html

Just some notes for me how to build and upload:

# create tag with release notes
git tag -a -m "$(git log --pretty='format:| %as %h %s' HEAD...$(git describe --tags |awk -F - '//{ print $1 }'))" VERSION
rm -rf build dist
python3 setup.py sdist bdist_wheel
python3 -m twine upload --repository pypi dist/*