380-breaking-changes.md

• Added parameter additionalHeader map[string]string to functions Client.OpenApiDeleteItem, Client.OpenApiGetAllItems, Client.OpenApiGetItem, Client.OpenApiPostItem, Client.OpenApiPutItem, Client.OpenApiPutItemAsync, Client.OpenApiPutItemSync [GH-380]
• Renamed functions GetOpenApiRoleById -> GetRoleById, GetOpenApiRoleByName -> GetRoleByName, GetAllOpenApiRoles -> GetAllRoles [GH-380]