RFR: 1821: The 'timeline` API in GitHub doesn't point out the sorting order

[Guoxiong Li]

Hi all,

This patch adjusts the code to avoid GitHub changing the sorting order of the `timeline` API in the future.
I worry that the time complexity may change from O(N) to O(N*N), but not sure.

Thanks for the review.

Best Regards,
-- Guoxiong

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Commit messages:
 - SKARA-1821

Changes: https://git.openjdk.org/skara/pull/1473/files
 Webrev: https://webrevs.openjdk.org/?repo=skara&pr=1473&range=00
  Issue: https://bugs.openjdk.org/browse/SKARA-1821
  Stats: 19 lines in 2 files changed: 15 ins; 1 del; 3 mod
  Patch: https://git.openjdk.org/skara/pull/1473.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1473/head:pull/1473

PR: https://git.openjdk.org/skara/pull/1473