Bundler could not find compatible versions for gem “kramdown”

So I am installing GitHub with this tut: http://literaturegeek.com/2016/04/20/building-static-website-with-jekyll-github-pages#section1-3

At step 7 it asks

Add the two following lines of text to gemfile, on separate lines and with the same lower-case formatting (as shown in the screenshot below), then save:

gem 'jekyll'
gem 'github-pages'

the corresponding files look like this:

source "https://rubygems.org"
ruby RUBY_VERSION

# Hello! This is where you manage which Jekyll version is used to run.
# When you want to use a different version, change it below, save the
# file and run `bundle install`. Run Jekyll with `bundle exec`, like so:
#
#     bundle exec jekyll serve
#
# This will help ensure the proper Jekyll version is running.
# Happy Jekylling!
gem "jekyll", "3.3.1"

# This is the default theme for new Jekyll sites. You may change this to anything you like.
gem "minima", "~> 2.0"

# If you want to use GitHub Pages, remove the "gem "jekyll"" above and
# uncomment the line below. To upgrade, run `bundle update github-pages`.
# gem "github-pages", group: :jekyll_plugins

# If you have any plugins, put them here!
group :jekyll_plugins do
   gem "jekyll-feed", "~> 0.6"
end

gem 'github-pages'

GEM
  remote: https://rubygems.org/
  specs:
    addressable (2.5.0)
      public_suffix (~> 2.0, >= 2.0.2)
    colorator (1.1.0)
    ffi (1.9.14-x64-mingw32)
    forwardable-extended (2.6.0)
    jekyll (3.3.1)
      addressable (~> 2.4)
      colorator (~> 1.0)
      jekyll-sass-converter (~> 1.0)
      jekyll-watch (~> 1.1)
      kramdown (~> 1.3)
      liquid (~> 3.0)
      mercenary (~> 0.3.3)
      pathutil (~> 0.9)
      rouge (~> 1.7)
      safe_yaml (~> 1.0)
    jekyll-feed (0.8.0)
      jekyll (~> 3.3)
    jekyll-sass-converter (1.5.0)
      sass (~> 3.4)
    jekyll-watch (1.5.0)
      listen (~> 3.0, < 3.1)
    kramdown (1.13.1)
    liquid (3.0.6)
    listen (3.0.8)
      rb-fsevent (~> 0.9, >= 0.9.4)
      rb-inotify (~> 0.9, >= 0.9.7)
    mercenary (0.3.6)
    minima (2.1.0)
      jekyll (~> 3.3)
    pathutil (0.14.0)
      forwardable-extended (~> 2.6)
    public_suffix (2.0.4)
    rb-fsevent (0.9.8)
    rb-inotify (0.9.7)
      ffi (>= 0.5.0)
    rouge (1.11.1)
    safe_yaml (1.0.4)
    sass (3.4.22)

PLATFORMS
  x64-mingw32

DEPENDENCIES
  jekyll (= 3.3.1)
  jekyll-feed (~> 0.6)
  minima (~> 2.0)

RUBY VERSION
   ruby 2.3.1p112

BUNDLED WITH
   1.13.6

After I run bundle install I get the following

 C:\Users\user\Documents\GitHub\freefront> bundle install
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 "kramdown":
 In snapshot (Gemfile.lock):
   kramdown (= 1.13.1)

  In Gemfile:
    github-pages x64-mingw32 was resolved to 1, which depends on
      kramdown (= 1.0.2) x64-mingw32

    jekyll (= 3.3.1) x64-mingw32 was resolved to 3.3.1, which depends on
      kramdown (~> 1.3) x64-mingw32

Running `bundle update` will rebuild your snapshot from scratch, using only
the gems in your Gemfile, which may resolve the conflict.
C:\Users\user\Documents\GitHub\freefront>

When I run 'bundle update' i get the following

C:\Users\user\Documents\GitHub\freefront> bundle update
Fetching gem metadata from https://rubygems.org/..........
Fetching version metadata from https://rubygems.org/..
Fetching dependency metadata from https://rubygems.org/.
Resolving dependencies...
Using json 1.8.3
Using public_suffix 2.0.4
Using colorator 1.1.0
Using ffi 1.9.14
Using forwardable-extended 2.6.0
Using sass 3.4.22
Using rb-fsevent 0.9.8
Using liquid 3.0.6
Using mercenary 0.3.6
Using rouge 1.11.1
Using safe_yaml 1.0.4
Using bundler 1.13.6
Gem::RemoteFetcher::FetchError: SSL_connect returned=1 errno=0 state=SSLv3 read
server certificate B: certificate verify failed
(https://rubygems.org/gems/i18n-0.7.0.gem)
An error occurred while installing i18n (0.7.0), and Bundler cannot continue.
Make sure that `gem install i18n -v '0.7.0'` succeeds before bundling.
C:\Users\user\Documents\GitHub\freefront>

I tryed installing the corresponding kramdown gems it seemed to be needed, but nothing has changed.

jekyll / jekyll-help

Bundler could not find compatible versions for gem “kramdown” #354