[DRE-maint] ruby-asetus is marked for autoremoval from testing

[Debian testing autoremoval watch]

ruby-asetus 0.3.0-1 is marked for autoremoval from testing on 2016-05-25

It (build-)depends on packages with these RC bugs:
818155: ruby-toml: FTBFS: NoMethodError: undefined method `map' for "strings"@50:Parslet::Slice