Release v1.13.3

• (jens-maus) updated node-ical to latest 0.16.1
• (klein0r) Use color picker in adapter settings
• (klein0r) Dropped Admin 4 UI
• (klein0r) Added Ukrainian language

Release v1.13.2

• (Apollon77) fix strange log messages by downgrading RRule again

Release v1.13.1

• (klein0r) Changed request library