RFR: 8282583: Update BCEL md to include the copyright notice

[Joe Wang]

On Thu, 3 Mar 2022 18:36:32 GMT, Lance Andersen <lancea at openjdk.org> wrote:

> > Yes, it's 2020. The latest release, 6.5.0, was released in 2020. The text comes from the NOTICE.txt file in the BCEL 6.5.0 release.
> 
> Thank you for the confirmation Joe!

Thanks Lance, and Iris!

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PR: https://git.openjdk.java.net/jdk/pull/7681