Update importing of tasks

tasks/main.yml

 ---
 # tasks file for hedgedocs-pad-lqdn_
 
-# - include : install-requirements.yml   # Dependencies installation
-- include : install-users.yml          # Setup user for this service
-- include : install-database.yml       # Setup DB
-- include : install-service.yml        # Setup service
-# - include : install-webserver.yml      # Setup nginx
-- include : configuration.yml          # Configure and run service
+- import_tasks: install-users.yml          # Setup user for this service
+- import_tasks: install-database.yml       # Setup DB
+- import_tasks: install-service.yml        # Setup service
+- import_tasks: configuration.yml          # Configure and run service