update .gitignore

.gitignore

@@ -13,3 +13,4 @@ xcuserdata
 *.moved-aside
 DerivedData
 *.xcuserstate
+timeline.xctimeline

CryptoSwift/Playground/CryptoPlayground.playground/timeline.xctimeline

@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<Timeline
-   version = "3.0">
-   <TimelineItems>
-      <LoggerValueHistoryTimelineItem
-         documentLocation = "#CharacterRangeLen=0&amp;CharacterRangeLoc=146&amp;EndingColumnNumber=6&amp;EndingLineNumber=5&amp;StartingColumnNumber=5&amp;StartingLineNumber=5&amp;Timestamp=445557880.049288">
-      </LoggerValueHistoryTimelineItem>
-   </TimelineItems>
-</Timeline>