Update README.md

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@ -16,7 +16,7 @@ Although the C++ tool itself is open source with a permissive license (Apache 2.
* George M. Eberhart - Copyright (c) 2022
* LeRoy Pea - Copyright (c) 9/8/1988 (updated 3/17/2005). Permission was given for use as long as he is attributed.
* Dr. Donald A. Johnson - Copyright (c) 2012
* Dr. Donald A. Johnson - Copyright (c) 2012. Efforts to contact him by email in 2023 have been unsuccessful.
* Fred Keziah - Copyright (c) 1958. This poster hasn't been updated in 65 years, so it's probably fine for commercial usage.
* Dr. Jacques F. Vallée - Copyright (c) 1993
* Richard Geldreich, Jr. - Copyright (c) 2023. Commercial usage permitted as long as attribution is given.