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Fix trivial typo in Readme (GH-2185)

Replace platform with platforms.
C
csabella committed
4ebf03d109f827c91a23256a447c1d74a203dfee
Parent: 526b226
Committed by Mariatta <Mariatta@users.noreply.github.com> on 6/14/2017, 1:32:06 PM