Updated the .gitignore file with the latest ignore flags for Swift.

.gitignore

@@ -2,7 +2,12 @@
 .DS_Store
 
 # Xcode
+
+## Build generated
 build/
+DerivedData
+
+## Various settings
 *.pbxuser
 !default.pbxuser
 *.mode1v3
@@ -12,14 +17,22 @@ build/
 *.perspectivev3
 !default.perspectivev3
 xcuserdata
+
+## Other
 *.xccheckout
 *.moved-aside
-DerivedData
+*.xcuserstate
+*.xcscmblueprint
+
+## Obj-C/Swift specific
 *.hmap
 *.ipa
-*.xcuserstate
 
-# SPM
+## Playgrounds
+timeline.xctimeline
+playground.xcworkspace
+
+# Swift Package Manager
 .build/
 
 # Carthage