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

[Joe Wang]

Update BCEL md to include the copyright notice.

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Commit messages:
 - 8282583: Update BCEL md to include the copyright notice

Changes: https://git.openjdk.java.net/jdk/pull/7681/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7681&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282583
  Stats: 5 lines in 1 file changed: 3 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7681.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7681/head:pull/7681

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