add .xccheckout to Objective-C gitignore

bdewater · bdewater · commit 56dbce3df3b1 · 2013-09-17T12:42:12.000+02:00
This is a file that Xcode 5 uses for version control, doesn't need to be checked in. Also see http://stackoverflow.com/a/18448100/1877078
diff --git a/Objective-C.gitignore b/Objective-C.gitignore
@@ -15,6 +15,7 @@ profile
 DerivedData
 .idea/
 *.hmap
+*.xccheckout
 
 #CocoaPods
 Pods
