[FAB-2789] Document minimum Docker Compose version
[FAB-2789] Document minimum Docker Compose version

The docs specify the Docker version but not the Docker
Compose version.  Add Docker Compose 1.8.1+ as prereq.
Also changes MacOSX to macOS as that's what Apple is
using these days

https://jira.hyperledger.org/browse/FAB-2789

[ci-skip]

Change-Id: I62e4adb78126e14e3a4e59a6e77cc2f2891b6283
Signed-off-by: Gari Singh <10008a422f4be611b73174084ba2f7f909d5b402@gmail.com>

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