Update copyright year

Author: clemiller

LICENSE.txt

@@ -4,7 +4,7 @@ The MITRE Corporation (MITRE) hereby grants you a non-exclusive, royalty-free li
 development, and commercial purposes. Any copy you make for such purposes is authorized provided that you reproduce
 MITRE's copyright designation and this license in any such copy.
 
-"© 2023 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation."
+"© 2024 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation."
 
 Disclaimers
 -----------

README.md

@@ -58,7 +58,7 @@ The Usage document includes documentation of the ATT&CK data model as well as co
 
 ## Notice 
 
-Copyright 2020-2021 The MITRE Corporation. Approved for public release. Case number 19-3504.
+Copyright 2020-2024 The MITRE Corporation. Approved for public release. Case number 19-3504.
 
 This project makes use of ATT&CK®