Plugin not compatible with Jekyll 4

[Bertrand Keller]

Is your feature request related to a problem? Please describe the problem you're trying to solve.

The new version of Jekyll is not compatible with jekyll-include-cache

Bundler could not find compatible versions for gem "jekyll":
  In Gemfile:
    jekyll

    jekyll-include-cache was resolved to 0.1.0, which depends on
      jekyll (~> 3.3)

Describe the solution you'd like

Modify the jekyll-include-cache.gemspec and update, maybe, the plugin.