tox.ini: install pytidylib from PyPI
tox.ini: install pytidylib from PyPI

PyTidyLib Python 3 issues have been fixed in 0.2.3 release

cyisfor/Python-Markdown,dataquestio/Python-Markdown,Situphen/Python-ZMarkdown,gogobook/Python-Markdown,fernandezcuesta/Python-Markdown,Situphen/Python-ZMarkdown,evertqin/Python-Markdown,fernandezcuesta/Python-Markdown,dataquestio/Python-Markdown,me-and/Python-Markdown,cyisfor/Python-Markdown,dataquestio/Python-Markdown,Situphen/Python-ZMarkdown,joachimneu/Python-Markdown,cyisfor/Python-Markdown,fernandezcuesta/Python-Markdown,waylan/Python-Markdown,joachimneu/Python-Markdown,zestedesavoir/Python-ZMarkdown,evertqin/Python-Markdown,me-and/Python-Markdown,zestedesavoir/Python-ZMarkdown,gogobook/Python-Markdown,zestedesavoir/Python-ZMarkdown,joachimneu/Python-Markdown,gogobook/Python-Markdown,waylan/Python-Markdown,evertqin/Python-Markdown,me-and/Python-Markdown