[v2] Incompatibility with last Middleman version

[Spone]

Hi,

My Gemfile:

gem "middleman", "~>3.3.7"
gem "middleman-livereload", "~> 3.1.0"
gem "livingstyleguide", github: "hagenburger/livingstyleguide", branch: "v2"

When I run bundle:

Fetching gem metadata from http://rubygems.org/.........
Fetching additional metadata from http://rubygems.org/..
Resolving dependencies...
Bundler could not find compatible versions for gem "tilt":
  In Gemfile:
    middleman (~> 3.3.7) ruby depends on
      middleman-core (= 3.3.7) ruby depends on
        tilt (< 2.0, ~> 1.4.1) ruby

    livingstyleguide (>= 0) x86-mingw32 depends on
      tilt (2.0.1)

Should I use another Middleman version?

[Spone]

I managed to make it work for now, using

gem "middleman", "4.0.0.alpha.6"

which removes the tilt < 2.0 constraint, but I'd rather use a stable version as the alpha still seems a bit broken.