[DRE-maint] Bug#890691: ruby-bio FTBFS with ruby 2.5

[Andreas Tille]

Hi,

I'd love to fix this bug since this package is of relevance for Debian
Med.  It seems to boil down to

   Error: test_na_seqstat(Bio::TestShellPluginSeq): ArgumentError: incomplete format specifier; use %% (double %) instead

which sounds pretty easy for somebody who speaks Ruby (which is not the
case for me).  Could anybody provide a patch (or just do a team upload
of this package which I updated in Git to latest upstream since Mai)?

Thanks a lot

        Andreas.

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