Integrated: Version updated to 8.1.

[Leonid Kuskov]

Version updated to 8.1.

-------------

Commit messages:
 - Version updated to 8.1.

Changes: https://git.openjdk.org/asmtools/pull/74/files
  Webrev: https://webrevs.openjdk.org/?repo=asmtools&pr=74&range=00
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/asmtools/pull/74.diff
  Fetch: git fetch https://git.openjdk.org/asmtools.git pull/74/head:pull/74

PR: https://git.openjdk.org/asmtools/pull/74