Update README.md

README.md

@@ -8,13 +8,13 @@
 [json](https://github.com/nlohmann/json): Copyright (c) 2013-2022 Niels Lohmann (MIT license)
 
 ## Data files (in 'bin' directory): 
-* George M. Eberhart - Copyright 2022
-* LeRoy Pea - Copyright 9/8/1988 (updated 3/17/2005)
-* Dr. Donald A. Johnson - Copyright 2012
-* Fred Keziah - Copyright 1958
-* Dr. Jacques F. Vallée - Copyright 1993
+* George M. Eberhart - Copyright (c) 2022
+* LeRoy Pea - Copyright (c) 9/8/1988 (updated 3/17/2005)
+* Dr. Donald A. Johnson - Copyright (c) 2012
+* Fred Keziah - Copyright (c) 1958
+* Dr. Jacques F. Vallée - Copyright (c) 1993
+* Richard Geldreich, Jr. - Copyright (c) 2023
 * NICAP - Unknown copyright status
-* Richard Geldreich, Jr. - Copyright 2023
 
 Note: Although the C++ tool itself is open source with a permissive license (Apache 2.0), any commercial use of the copyrighted data in this repository may require permission from one or more copyright holders.