Updated gitignore.

Author: Edward Smith

.gitignore

@@ -42,12 +42,10 @@ xcuserdata/
 # https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
 #
 Pods/
+Podfile.lock
 
 # Carthage
-#
-# Add this line if you want to avoid checking in source code from Carthage dependencies.
-# Carthage/Checkouts
-
+Carthage/Checkouts
 Carthage/Build
 
 # fastlane