Update service.md
Update service.md

Adding missing import. Without it the test fails.
jkarsrud/guides,MarkMT/guides,bmac/guides,MarkMT/guides,skaterdav85/guides,bmac/guides,MarkMT/guides,davidpett/guides,jkarsrud/guides,skaterdav85/guides,ubuntuvim/guides,nicobot/guides,knownasilya/guides,skaterdav85/guides,jkarsrud/guides,HeroicEric/guides,jkarsrud/guides,ubuntuvim/guides,tleskin/guides,ubuntuvim/guides,tleskin/guides,ubuntuvim/guides,skaterdav85/guides,davidpett/guides,nicobot/guides,nicobot/guides,HeroicEric/guides,davidpett/guides,HeroicEric/guides,davidpett/guides,bmac/guides,knownasilya/guides,MarkMT/guides,knownasilya/guides,knownasilya/guides,tleskin/guides,bmac/guides