Update docs

hacking/README.md

@@ -53,6 +53,7 @@ The above command simulates an adversary executing the following steps:
    sell the 40 `token_b`, increasing their balance of `token_a` by 1 and maintaining
    their balance of `token_b`.
 
+### Animated GIF of attack
 ![](./sandwich-attack.gif)
 
 
@@ -76,6 +77,7 @@ The above command simulates an adversary executing the following steps:
    * execute the victim's transaction to see if `guess` was enough to conver the victim's transfer transaction
 3) If the `guess` was enough to cover the victim's transfer transaction then `guess` is the transfer amount
 
+### Animated GIF of attack
 ![](./transfer-privacy-attack.gif)