Update readme for 15.3.0
(cherry picked from commit 7251f6a6e9444c4d4da80649714f9fd6e9e79cfa)
P
Paul O’Shannessy committed
7d4e97f9e5ff23cdfd69065cb2f6862b698e09a6
Parent: 26f55b4
(cherry picked from commit 7251f6a6e9444c4d4da80649714f9fd6e9e79cfa)