Release 0.2.7

Release before updating Lightning dependency

What's Changed

• Fix neighbor extension compilation looking for non-existent backwards.cu by @RaulPPelaez in #204
• Remove dtype parameter, use previously existing "precision" instead by @RaulPPelaez in #208

Full Changelog: 0.2.6...0.2.7

Release 0.2.6

0.2.6 release