Merge pull request #899 from openHPI/dependabot/bundler/kramdown-2.3.1

Bump kramdown from 2.3.0 to 2.3.1

Author: MrSerth

Gemfile.lock

@@ -192,7 +192,7 @@ GEM
       activerecord
       kaminari-core (= 1.2.1)
     kaminari-core (1.2.1)
-    kramdown (2.3.0)
+    kramdown (2.3.1)
       rexml
     listen (3.4.1)
       rb-fsevent (~> 0.10, >= 0.10.3)