Version bump, Style guide, dns records updates optional, and input validation

output.domain_records.tf

@@ -0,0 +1,7 @@
+output "domain_records" {
+  description = "The DNS records created for the instance, if create_dns_record is true."
+  value = {
+    ipv4 = try(linode_domain_record.this_ipv4[0], null)
+    ipv6 = try(linode_domain_record.this_ipv6[0], null)
+  }
+}