Update README.md

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### Data files (in 'bin' directory):
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 (in any format, textual, JSON, Markdown, HTML, raw binary records, etc.) may require permission from one or more copyright holders**:
* George M. Eberhart - Copyright (c) 2022
* George M. Eberhart - Copyright (c) 2022. Efforts to contact have been unsuccessful. This is the original PDF's copyright.
* 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. 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.