RFR: 7564: Early access splash for 8.3

[Marcus Hirt]

Updating the splash in master.

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Commit messages:
 - 7564: Early access splash for 8.3

Changes: https://git.openjdk.java.net/jmc/pull/382/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jmc&pr=382&range=00
  Issue: https://bugs.openjdk.java.net/browse/JMC-7564
  Stats: 0 lines in 1 file changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jmc/pull/382.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/382/head:pull/382

PR: https://git.openjdk.java.net/jmc/pull/382