Update json dependency to v2.0

[nhoizey]

I'm trying to use both algoliasearch-jekyll and jekyll-webmention_io on my website.

But:

• algoliasearch-jekyll requires json 1.8
• jekyll-webmention_io requires json 2.0

I tried to fork algoliasearch-jekyll and on the develop branch update the Gemfile, or even the gemfiles/jekyll_v3.gemfile, but bundle update still tries to use json 1.8 for algoliasearch-jekyll:

Fetching https://github.com/nhoizey/algoliasearch-jekyll.git
Fetching gem metadata from https://rubygems.org/..............
Fetching version metadata from https://rubygems.org/...
Fetching dependency metadata from https://rubygems.org/..
Resolving dependencies...
Bundler could not find compatible versions for gem "json":
  In Gemfile:
    json

    algoliasearch-jekyll was resolved to 0.8.0, which depends on
      algoliasearch (~> 1.4) was resolved to 1.14.0, which depends on
        json (>= 1.5.1)

    algoliasearch-jekyll was resolved to 0.8.0, which depends on
      json (~> 1.8)

    jekyll-webmention_io (~> 2.6.1) was resolved to 2.6.1, which depends on
      json (~> 2.0)

I did this on a webmention-gem branch of my site repository.

It looks like I have reached my limits in Ruby…