Upgrade default_value_for from 3.0.1 to 3.0.2.

Includes support for Rails 5. Working toward #14286 (moved).

Changelog: https://github.com/FooBarWidget/default_value_for/compare/release-3.0.1...release-3.0.2

mentioned in issue #14286 (moved)

Status changed to merged

mentioned in commit d7e3ecf4

Mentioned in issue #14286 (moved)