Add Makefile target for running Devel::Cover
Add Makefile target for running Devel::Cover

Makes it easier for those of us playing along at home to spot what's
missing. :-)

Signed-off-by: Ask Bjørn Hansen <1c8f09270fc33a393af3eaf0b2ebf58eb9bbbcc2@develooper.com>

mndrix/net-couchdb