Remove p-r-a-v-i-n from terraform config

[Stormheg]

They have removed themselves, if not removed from config terraform will keep adding them back.

[cunla]

Terraform plan for members

Plan: 0 to add, 0 to change, 1 to destroy.

Terraform used the selected providers to generate the following execution
plan. Resource actions are indicated with the following symbols:
-   destroy

Terraform will perform the following actions:

  # github_membership.this["p-r-a-v-i-n"] will be destroyed
  # (because key ["p-r-a-v-i-n"] is not in for_each map)
-   resource "github_membership" "this" {
-       downgrade_on_destroy = false -> null
-       etag                 = "W/\"49a2359d6d5469c8ffa36380b092fea8bac124ab6e5e7de1027cf2dfe770623e\"" -> null
-       id                   = "django-commons:p-r-a-v-i-n" -> null
-       role                 = "member" -> null
-       username             = "p-r-a-v-i-n" -> null
    }

Plan: 0 to add, 0 to change, 1 to destroy.

📝 Plan generated in Plan org membership changes and list them in a PR #81