Removed upgrade xctool
Removed upgrade xctool

Travis servers are now up-to-date

redengineer/snowplow-objc-tracker,redengineer/snowplow-objc-tracker,chunkyguy/snowplow-objc-tracker,chunkyguy/snowplow-objc-tracker,iamjason/snowplow-objc-tracker,iamjason/snowplow-objc-tracker,iamjason/snowplow-objc-tracker,snowplow/snowplow-objc-tracker,snowplow/snowplow-objc-tracker,snowplow/snowplow-objc-tracker,snowplow/snowplow-objc-tracker