Log Message:
Changes 3.4.0:

Over the last couple years we've worked very closely with the Ruby Sass team to
reach Sass 3.4 compatibility.

It's become clear that need to draw a line in sand with exactly how exactly
we can match Sass 3.4, especially in the face of changes in Sass 3.5.

With this release the LibSass team is marking the completion of active
development on Sass 3.4 compatibility. From today we'll focus our efforts on
Sass 3.5 compatibility, first prioritising CSS compatibility features like
support for CSS custom property and CSS grids.