Merge branch '22-correct-jekyll-paginate-plugin' into 'master'

Update Gemfile, .gitlab-ci.yml files

Closes #22

See merge request core-services/r3lab/r3-pages!26

.gitlab-ci.yml

@@ -27,6 +27,9 @@ build the website:
 Deploy to production:
   stage: deploy
   image: alpine:3.1
+  only:
+    - tags
+    - master
   before_script:
     - 'which ssh-agent || ( apk add --update openssh )'
     - eval $(ssh-agent -s)

Gemfile

@@ -21,8 +21,7 @@ gem 'jekyll-theme-lcsb-default', '~> 0.3'
 # If you have any plugins, put them here!
 group :jekyll_plugins do
  gem "jekyll-paginate-v2", 
-     "~> 2",
-     :git => "https://github.com/sverrirs/jekyll-paginate-v2.git"
+     "3.0"
 
  gem "jekyll-feed", 
      "~> 0.6"