This is the official repository for css2inline.
Since the release of v0.2.0 to TER and packagist, the underlying library emogrifier is now updated and referenced via composer.
This makes this extension now a complete duplicate of the other TYPO3 extension emogrifier and will as such probably not be maintained anymore.
YOU ARE ADVISED TO UPDATE YOUR TYPOSCRIPT CONFIGURATION AND SWITCH NOW TO EXT:emogrifier.
This basically means replacing
page.10 = USER
page.10.userFunc = tx_css2inline_pi1->main
by
page.10 = EMOGRIFIER
for your newsletter definition :)