Gyuho Lee 605dcb57a8 Documentation/upgrades: highlight 3.2 breaking change, require gRPC v1.7.4
There's already a section called "Server upgrade checklists" below.
Instead, highlight the listen URLs change as a breaking change in
server. Also update 3.2 and 3.3 gRPC requirements as v1.7.4.

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>
2017-12-07 21:28:19 -08:00
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