[DRE-maint] sup-mail is marked for autoremoval from testing

[Debian testing autoremoval watch]

sup-mail 0.22.1-3 is marked for autoremoval from testing on 2020-03-23

It is affected by these RC bugs:
952089: sup-mail: FTBFS: ERROR: Test "ruby2.7" failed: ArgumentError: wrong number of arguments (given 2, expected 1)

It (build-)depends on packages with these RC bugs:
952086: ruby-highline: FTBFS: ERROR: Test "ruby2.7" failed: Error: test_Highline_String_is_yaml_serializable(TestStringExtension): RuntimeError: CRITICAL: RUBYGEMS_ACTIVATION_MONITOR.owned?: before false -> after true