Explicitly use Swift 5.0 version before CI prepared

fastlane/Fastfile

@@ -14,9 +14,9 @@ platform :ios do
     
   lane :test_ci do
     if ENV["DESTINATION"].include? "watchOS" then
-        build(destination: ENV["DESTINATION"])
+        build(destination: ENV["DESTINATION"], swift_version: "5.0")
     else
-        test(destination: ENV["DESTINATION"])
+        test(destination: ENV["DESTINATION"], swift_version: "5.0")
     end
   end