Support for Jekyll 4.0

[Goles]

I think this theme has a hard dependency on Jekyll 3.6, is supporting 4.0 in the roadmap?

Bundler could not find compatible versions for gem "jekyll":
  In snapshot (Gemfile.lock):
    jekyll (= 4.0.0)

  In Gemfile:
    jekyll (~> 4.0.0)

    jekyll-theme-clean-blog was resolved to 4.0.1, which depends on
      jekyll (~> 3.6)

Running `bundle update` will rebuild your snapshot from scratch, using only
the gems in your Gemfile, which may resolve the conflict.

[mattcarey]

I am getting this error as well. Is there a work around?

[VascoRibeiroPereira]

you can install and run jekyll 3.6 (dont forget to change the gem "jekyll", "~> 3.6" in the Gemfile). This worked for me.

[thejimnicholson]

By updating the Gemfile and .gemspec, I was able to use this theme with Jekyll 4.0. I've submitted a PR for the changes I made: #223

[djcaesar9114]

Indeed, the support for Jekyll 4.0 would be great...

[davidtmiller]

Done, thanks all!