Deparse named arguments to use the new => operator instead of :=

Robert Haas <rhaas@postgresql.org>

Commit: e044a44949c5b9c9f548e8a1cd4bf0b50fb2a1cc
Author: Robert Haas <rhaas@postgresql.org>
Date: 2015-05-01T13:37:10Z
Releases: 9.5.0
Deparse named arguments to use the new => operator instead of :=

Tom Lane pointed out that this wasn't done, and asked whether that was
intentional.  Subsequent discussion was in favor of making the change,
so here we go.

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