cover_me -> simplecov
adding is_eligible_promo flag for payer promotions, see https://developers.facebook.com/docs/concepts/payerpromotions/
Merge pull request #348 from Bichinger/master

adding is_eligible_promo flag for payer promotions
venue could be `[]` when it's not set.

I believe it's FB's bug though...
close #352
v2.7.11
maybe this is also FB's bug?

close #350
close #351
v2.7.12