[DRE-maint] reel is marked for autoremoval from testing

[Debian testing autoremoval watch]

reel 0.6.1-4 is marked for autoremoval from testing on 2018-04-04

It is affected by these RC bugs:
892185: reel: FTBFS and Debci failure with Ruby 2.5

It (build-)depends on packages with these RC bugs:
892192: ruby-celluloid-io: FTBFS and Debci failure with Ruby 2.5