Fix Fastlane test devices

Launching iPhone 5s simulator is unreliable and often causes tests to fail. Upgraded iOS 9 device to iPhone 6s

Author: fjcaetano

fastlane/Fastfile

@@ -13,7 +13,7 @@ platform :ios do
   devices = ["iPhone XR (~> 12)"]
   devices << "iPhone X (~> 11)" if !Helper.is_ci?
   devices << "iPhone 7 (~> 10)" if !Helper.is_ci?
-  devices << "iPhone 5s (~> 9)" if !Helper.is_ci?
+  devices << "iPhone 6s (~> 9)" if !Helper.is_ci?
 
   desc "Runs the following lanes:\n- test\n- pod_lint\n- carthage_lint"
   lane :ci do