remove extra spaces from deprecation message

[y-yagi]

# before
DEPRECATION WARNING:               Time columns will become time zone aware in Rails 5.1. This
              still causes `String`s to be parsed as if they were in `Time.zone`,
              and `Time`s to be converted to `Time.zone`.

              To keep the old behavior, you must add the following to your initializer:

                  config.active_record.time_zone_aware_types = [:datetime]

              To silence this deprecation warning, add the following:

                  config.active_record.time_zone_aware_types << :time

# after
DEPRECATION WARNING: Time columns will become time zone aware in Rails 5.1. This
still causes `String`s to be parsed as if they were in `Time.zone`,
and `Time`s to be converted to `Time.zone`.

To keep the old behavior, you must add the following to your initializer:

    config.active_record.time_zone_aware_types = [:datetime]

To silence this deprecation warning, add the following:

    config.active_record.time_zone_aware_types << :time

[rails-bot]

r? @eileencodes

(@rails-bot has picked a reviewer for you, use r? to override)

[kaspth]

You need to require the core_ext files that implement the methods you've added, so the isolation tests that run on merges pass. Thanks 😁

[y-yagi]

oops sorry. I added the necessary require, and ran the isolation test.
Thanks for reviewing!

[eileencodes]

Thanks! 😄

[y-yagi]

Thanks!