[DRE-maint] ruby-oily-png 1.2.1~dfsg-4 MIGRATED to testing

[Debian testing watch]

FYI: The status of the ruby-oily-png source package
in Debian's testing distribution has changed.

  Previous version: 1.2.1~dfsg-3
  Current version:  1.2.1~dfsg-4

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