Support terraform-provider-github v4 (#168)

Author: foooomio

terraform/github/branch_protection.tf

@@ -1,6 +1,6 @@
 resource "github_branch_protection" "hackathon_master" {
-  repository     = "hackathon"
-  branch         = "master"
+  repository_id  = "hackathon"
+  pattern        = "master"
   enforce_admins = false
 
   required_status_checks {}
@@ -9,33 +9,31 @@ resource "github_branch_protection" "hackathon_master" {
     dismiss_stale_reviews = false
   }
 
-  restrictions {
-    teams = ["imas_hack"]
-  }
+  push_restrictions = [
+    "imas_hack"
+  ]
 }
 
 resource "github_branch_protection" "mastodon_imastodon" {
-  repository     = "mastodon"
-  branch         = "imastodon"
+  repository_id  = "mastodon"
+  pattern        = "imastodon"
   enforce_admins = false
 
   required_status_checks {
     strict   = false
     contexts = [
-      "ci/circleci: test-ruby2.6",      
+      "ci/circleci: test-ruby2.6",
     ]
   }
 
   required_pull_request_reviews {
     dismiss_stale_reviews = false
   }
-
-  restrictions {}
 }
 
 resource "github_branch_protection" "imasparql_master" {
-  repository     = "imasparql"
-  branch         = "master"
+  repository_id  = "imasparql"
+  pattern        = "master"
   enforce_admins = false
 
   required_status_checks {
@@ -48,6 +46,4 @@ resource "github_branch_protection" "imasparql_master" {
     require_code_owner_reviews = true
     required_approving_review_count = 1
   }
-
-  restrictions {}
 }