Update CITATION.cff

Author: coduri

CITATION.cff

@@ -2,7 +2,7 @@
 # Visit https://bit.ly/cffinit to generate yours today!
 
 cff-version: 1.2.0
-title: VisualCrypto - A toolkit for image-based secret sharing
+title: VisualCrypto - A Python-based toolkit for image-based secret sharing
 message: "If you use this software, please cite it as below."
 type: software
 authors:
@@ -15,4 +15,3 @@ keywords:
   - visual secret sharing
 license: MIT
 version: 1.0.0
-date-released: '2025-02-23'