Add fairsoftwarechecklist to list of regexes for badge matching during checklist check

[piehld]

Checklist

• Code follows the contributing guidelines of the project
• This PR solves an existing issue and provided solution was discussed
• The fix has been locally tested
• Code follows the project's coding standards
• Unit tests covering the new feature have been added
• All existing tests pass
• The documentation has been updated to reflect the new feature

List of related issues or pull requests

• fairsoftwarechecklist not included in checklist check #382

Briefly describe the changes made in this pull request

Addition of fairsoftwarechecklist to list of possible checklist badges to check for during checklist check.

Additional Notes

Please refer to the linked issue for more context. Also, because this change is so minimal, I didn't think it was necessary to add any additional tests, but please let me know if there is something you'd like me to add.

Instructions to review the pull request

# make a new temporary directory and cd into it
cd $(mktemp -d --tmpdir howfairis.XXXXXX)

# get a copy of the repo
git clone https://github.com/fair-software/howfairis .

# checkout the work from this branch 
git checkout <this branch>

# create a virtual environment named venv3
python3 -m venv venv3

# activate the virtual environment
source venv3/bin/activate

# update pip and friends
python3 -m pip install --upgrade pip wheel setuptools

# install runtime dependencies
python3 -m pip install .

# and, if you need it, the development tools
python3 -m pip install .[dev]

Keep what you need from below, extend as necessary

# run the unit tests
pytest

# tests against a live infrastructure
pytest livetests/

# cli tests
bash clitests/script.sh

# run linter
prospector

# import style
isort --check-only howfairis

# any additional steps for checking