What is the average rating for the "crime-junkie" podcast?
"crime-junkie" podcast refers to title = 'crime-junkie'; average rating = Divide (Sum(rating), Count(rating))
SELECT AVG(T2.rating) FROM podcasts AS T1 INNER JOIN reviews AS T2 ON T2.podcast_id = T1.podcast_id WHERE T1.title = 'Crime Junkie'