chore: add contributors to LICENSE

Author: JoshBashed

LICENSE

@@ -1,5 +1,6 @@
 ISC License
 
+Copyright 2025 BLAKE3-Swift Contributors
 Copyright 2024 Joshua Brest
 
 Permission to use, copy, modify, and/or distribute this software for any 
@@ -12,4 +13,4 @@ FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
 INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM 
 LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR 
 OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR 
-PERFORMANCE OF THIS SOFTWARE.
+PERFORMANCE OF THIS SOFTWARE.