Update README.md

Author: technovision99

not-so-smart-contracts/cairo/README.md

@@ -21,9 +21,11 @@ Each _Not So Smart Contract_ includes a standard set of information:
 | [View state modifications](view_state) | View functions don't prevent state modifications |
 | [Arithmetic overflow](arithmetic_overflow) | Arithmetic in Cairo is not safe by default |
 | [Signature replays](replay_protection) | Account abstraction requires robust reuse protections |
+| [L1 to L2 Address Conversion](l1_to_l2_address_conversion) | L1 to L2 messaging requires L2 address checks |
+| [Incorrect Felt Comparison](incorrect_felt_comparison) | Unexpected results can occur during felt comparison | 
 
 ## Credits
 
 These examples are developed and maintained by [Trail of Bits](https://www.trailofbits.com/).
 
-If you have questions, problems, or just want to learn more, then join the #ethereum channel on the [Empire Hacking Slack](https://empireslacking.herokuapp.com/) or [contact us](https://www.trailofbits.com/contact/) directly.
+If you have questions, problems, or just want to learn more, then join the #ethereum channel on the [Empire Hacking Slack](https://empireslacking.herokuapp.com/) or [contact us](https://www.trailofbits.com/contact/) directly.