Organize .gitignore (#265)

.gitignore

@@ -26,9 +26,6 @@ DerivedData
 # Bundler
 .bundle
 
-Pods/
-Carthage/Checkouts
-!Carthage/Build
 # Xcode
 #
 # gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
@@ -72,14 +69,12 @@ playground.xcworkspace
 # We recommend against adding the Pods directory to your .gitignore. However
 # you should judge for yourself, the pros and cons are mentioned at:
 # https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
-#
-# Pods/
+
+Pods
 
 # Carthage
-#
-# Add this line if you want to avoid checking in source code from Carthage dependencies.
-# Carthage/Checkouts
 
+Carthage/Checkouts
 Carthage/Build
 .carthage_cache.yml