Add customer field to PromotionCode

[sezaru]

No description provided.

[sezaru]

Customer field is missing in PromotionCode struct.

For some reason, after this change I'm getting this error:

== Compilation error in file lib/core/stripe/promotion_code.ex ==
** (ArgumentError) errors were found at the given arguments:

  * 1st argument: the table identifier does not refer to an existing ETS table

    (stdlib 3.15) :ets.lookup_element(:hackney_config, :mod_metrics, 2)
    (hackney 1.17.4) /home/sezdocs/projects/tip-off/alarms_backend/payments/deps/hackney/src/hackney_metrics.erl:27: :hackney_metrics.get_engine/0
    (hackney 1.17.4) /home/sezdocs/projects/tip-off/alarms_backend/payments/deps/hackney/src/hackney_connect.erl:75: :hackney_connect.create_connection/5
    (hackney 1.17.4) /home/sezdocs/projects/tip-off/alarms_backend/payments/deps/hackney/src/hackney_connect.erl:44: :hackney_connect.connect/5
    (hackney 1.17.4) /home/sezdocs/projects/tip-off/alarms_backend/payments/deps/hackney/src/hackney.erl:335: :hackney.request/5
    (stripity_stripe 2.10.0) lib/stripe/api.ex:380: Stripe.API.do_perform_request_and_retry/6
    (stripity_stripe 2.10.0) lib/stripe/request.ex:198: Stripe.Request.make_request/1
    lib/core/stripe/promotion_code.ex:9: Core.Stripe.PromotionCode.maybe_get/2
    lib/core/stripe/promotion_code.ex:33: (file)
    (elixir 1.12.0) lib/kernel/parallel_compiler.ex:319: anonymous fn/4 in Kernel.ParallelCompiler.spawn_workers/7

But using the commit in the 2.10.0 tag works here.. Not sure if this is something to do with my change or with something broken in the master branch

[snewcomer]

@sezaru Mind brining in the master branch and see if we still get an error?

[sezaru]

@snewcomer just tested it, I was able to compile the whole project now without any issues.

[snewcomer]

Beautiful! Great job here