sort record types in README alphabetically

README.md

@@ -211,6 +211,22 @@ And an answer, additional, or authority looks like this
 }
 ```
 
+#### `NAPTR`
+
+``` js
+{
+  data:
+    {
+      order: 100,
+      preference: 10,
+      flags: 's',
+      services: 'SIP+D2U',
+      regexp: '!^.*$!sip:customer-service@example.com!',
+      replacement: '_sip._udp.example.com'
+    }
+}
+```
+
 #### `NS`
 
 ``` js
@@ -366,22 +382,6 @@ The options `PADDING`, `CLIENT_SUBNET`, `TCP_KEEPALIVE` and `KEY_TAG` support en
 }
 ```
 
-#### `NAPTR`
-
-``` js
-{
-  data:
-    {
-      order: 100,
-      preference: 10,
-      flags: 's',
-      services: 'SIP+D2U',
-      regexp: '!^.*$!sip:customer-service@example.com!',
-      replacement: '_sip._udp.example.com'
-    }
-}
-```
-
 When encoding, scalar values are converted to an array and strings are converted to UTF-8 encoded Buffers. When decoding, the return value will always be an array of Buffer.
 
 If you need another record type, open an issue and we'll try to add it.