Masayuki Igawa a1f3f859fc
Add v15.0.0 releasenote
This commit adds v15.0.0 releasenote. Because v15.0.0 was already
released.

Change-Id: Icc58ea6bd2e792a7fd38af6ef2f28d9cf5741a39
2017-02-18 11:56:24 +09:00
..
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