Straight on the heels of last week’s iPhone OS 3.1.3 update from Apple, The iPhone Dev Team hackers have released an updated Pwnage Tool to jailbreak the new release. But, there are a few catches.According to 9to5 Mac, the Justice League of iPhone hackers -- you know, the collective known as The iPhone Dev Team -- have made available Pwnage Tool 3.1.5, which adds the ability to jailbreak the latest iPhone OS 3.1.3. But unlike previous versions, the Dev Team is actually encouraging most users not to update this time.“iPhone 3G and 3GS unlockers should always be very wary to update their fir...