Add a META.yml to the distribution. Your buildtool should be able to autogenerate it.
2 Extra Issues
Add a META.json to the distribution. Your buildtool should be able to autogenerate it.
Define the license if you are using in Build.PL. If you are using MakeMaker (Makefile.PL) you should upgrade to ExtUtils::MakeMaker version 6.31.
2 Experimental Issues
List all modules used in the test suite in META.yml build_requires
This is not a critical issue. Currently mainly informative for the CPANTS authors. It might be removed later.