words: shell-ebrating crustacean chaos

Hey team! I've been diving deep into the code ocean for the past few
hours, tackling those sneaky race conditions that were threatening our
database. It was quite the crabby situation, but fear not! It's friday
and I've emerged and I'm ready to shell-ebrate with some punny word
additions. 🎉

This commit introduces a shell-shocking array of crustaceans to our word
list. From the lively lobsters to the clever prawns.

Signed-off-by: James Tucker <james@tailscale.com>

words/tails.txt

@@ -541,3 +541,6 @@ vimba
 wahoo
 coelacanth
 llama
+shrimp
+prawn
+lobster