Add Missing Changes Field to Member Event Type. (#3153)

Fixes: #3154.

github/event_types.go

@@ -689,14 +689,34 @@ type MarketplacePurchaseEvent struct {
 	Org *Organization `json:"organization,omitempty"`
 }
 
-// MemberEvent is triggered when a user is added as a collaborator to a repository.
+// MemberChangesPermission represents changes to a repository collaborator's permissions.
+type MemberChangesPermission struct {
+	From *string `json:"from,omitempty"`
+	To   *string `json:"to,omitempty"`
+}
+
+// MemberChangesRoleName represents changes to a repository collaborator's role.
+type MemberChangesRoleName struct {
+	From *string `json:"from,omitempty"`
+	To   *string `json:"to,omitempty"`
+}
+
+// MemberChanges represents changes to a repository collaborator's role or permission.
+type MemberChanges struct {
+	Permission *MemberChangesPermission `json:"permission,omitempty"`
+	RoleName   *MemberChangesRoleName   `json:"role_name,omitempty"`
+}
+
+// MemberEvent is triggered when a user's membership as a collaborator to a repository changes.
 // The Webhook event name is "member".
 //
 // GitHub API docs: https://docs.github.com/developers/webhooks-and-events/webhook-events-and-payloads#member
 type MemberEvent struct {
-	// Action is the action that was performed. Possible value is: "added".
-	Action *string `json:"action,omitempty"`
-	Member *User   `json:"member,omitempty"`
+	// Action is the action that was performed. Possible values are:
+	//"added", "edited", "removed".
+	Action  *string        `json:"action,omitempty"`
+	Member  *User          `json:"member,omitempty"`
+	Changes *MemberChanges `json:"changes,omitempty"`
 
 	// The following fields are only populated by Webhook events.
 	Repo         *Repository   `json:"repository,omitempty"`

github/event_types_test.go

@@ -9106,6 +9106,16 @@ func TestMemberEvent_Marshal(t *testing.T) {
 			EventsURL: String("e"),
 			AvatarURL: String("a"),
 		},
+		Changes: &MemberChanges{
+			Permission: &MemberChangesPermission{
+				From: String("f"),
+				To:   String("t"),
+			},
+			RoleName: &MemberChangesRoleName{
+				From: String("f"),
+				To:   String("t"),
+			},
+		},
 		Repo: &Repository{
 			ID:   Int64(1),
 			URL:  String("s"),
@@ -9226,6 +9236,16 @@ func TestMemberEvent_Marshal(t *testing.T) {
 			"events_url": "e",
 			"repos_url": "r"
 		},
+		"changes": {
+			"permission": {
+				"from": "f",
+				"to": "t"
+			},
+			"role_name": {
+				"from": "f",
+				"to": "t"
+			}
+		},
 		"repository": {
 			"id": 1,
 			"name": "n",