root/pypi: links for pretix-question-placeholders

root/pypi pretix-question-placeholders-0.6.0.tar.gz
root/pypi pretix-question-placeholders-0.5.0.tar.gz
root/pypi pretix-question-placeholders-0.4.0.tar.gz
root/pypi pretix-question-placeholders-0.3.0.tar.gz
root/pypi pretix-question-placeholders-0.2.0.tar.gz
root/pypi pretix-question-placeholders-0.1.0.tar.gz