RFR: 7093: Wrong copyright year

[Marcus Hirt]

Missed gurus comment in the last PR.

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Commit messages:
 - 7093: Wrong copyright year

Changes: https://git.openjdk.java.net/jmc/pull/199/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=199&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7093
  Stats: 11 lines in 9 files changed: 0 ins; 0 del; 11 mod
  Patch: https://git.openjdk.java.net/jmc/pull/199.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/199/head:pull/199

PR: https://git.openjdk.java.net/jmc/pull/199