Merge branch 'bump-version' into 'latest'

chore: bump version

See merge request core-services/jekyll-theme-lcsb-default!47

.gitlab-ci.yml

 # In case something goes horribly wrong, you can fall back to `image: ruby:latest`
-image: git-r3lab.uni.lu:4567/r3/docker/jekyll-lcsb:1.4
+image: git-r3lab.uni.lu:4567/r3/docker/jekyll-lcsb:1.6
 
 stages:
   - test

lib/jekyll-theme-lcsb-default.rb

@@ -3,5 +3,5 @@
 # Note: keep the format of NUMBER.NUMBER.NUMBER (where NUMBER is [0-9]+);
 # Otherwise Gitlab-CI could fail to detect the version (see .gitlab-ci.yml) and auto-tag the job
 module Theme
-    VERSION = "0.3.19"
+    VERSION = "0.4.0"
 end