Update Playgrounds

Author: cbaker6

ParseSwift.playground/Pages/2 - Finding Objects.xcplaygroundpage/Contents.swift

@@ -112,8 +112,8 @@ query.first { results in
     }
 }
 
-//: Query based on relative time. Have to be using MongoDB.
-/*let queryRelative = GameScore.query(relative("createdAt" < "10 minutes ago"))
+//: Query based on relative time.
+let queryRelative = GameScore.query(relative("createdAt" < "10 minutes ago"))
 queryRelative.find { results in
     switch results {
     case .success(let scores):
@@ -124,7 +124,6 @@ queryRelative.find { results in
         assertionFailure("Error querying: \(error)")
     }
 }
-*/
 
 let querySelect = query.select("score")
 querySelect.first { results in