mention that vehicles provide infinite power

src/chats/serenity.yaml

@@ -928,6 +928,7 @@
   - Sometimes the flashlight can help too. [press F]
   - But space is empty, so unless you point the flashlight at something, it won't do much.
   - "You can boost its brightness, but careful: It may drain more power than your reactor generates."
+  - If you ever run out of power, just hop into a vehicle, their reactors generate more than you'll need.
   - goto: generic_questions
 - Tell me about life in space.:
   - Sure, what do you want to know?