opam is marked for autoremoval from testing

[Debian testing autoremoval watch]

opam 2.0.0-5 is marked for autoremoval from testing on 2018-11-16

It (build-)depends on packages with these RC bugs:
885677: liblablgtksourceview2-ocaml: Depends on unmaintained gtksourceview2
911406: jsonm: jsonm FTBFS: dh_installdocs: Cannot find (any matches for) 
"README" (tried in .)