refactor: improve code quality and add automation

- Remove unnecessary return statement in auth module
- Comment out unused 'code' field in ResponseError struct
- Improve readme formatting with proper markdown
- Update dependencies in Cargo.lock
- Add Makefile with DNS record update automation commands

readme.md

@@ -1,18 +1,21 @@
 # GoDaddy DDNS
+
 ![godaddy-ddns](https://user-images.githubusercontent.com/4237627/147422997-f72018be-7f60-4e56-9a52-d2ac81e0dbd5.png)
 
 ## What is this?
+
 It's a Rust application to update GoDaddy DNS Records via REST API.
 
 ## Usage
-It order for the application to work, there needs to be: 
+
+It order for the application to work, there needs to be:
 
 * Environment variables:
   * `DOMAIN` - The domain to update
   * `KEY` - GoDaddy API Key
   * `SECRET` - GoDaddy API SECRET
 
-Info about how to generate the **KEY** and the **SECRET** can be found here: https://developer.godaddy.com/getstarted 
+Info about how to generate the **KEY** and the **SECRET** can be found here: <https://developer.godaddy.com/getstarted>
 
 * A file called `records.json` placed in `$HOME/.godaddy-ddns` with the following structure:
 
@@ -36,10 +39,10 @@ Info about how to generate the **KEY** and the **SECRET** can be found here: htt
 }
 ```
 
-### Fields of interest 
+### Fields of interest
 
 * name: `{string}` - Name of the record.
-* record_type: `{string}` - Type of the record (A, AAAA, CAA, CNAME, MX, NS, SRV, TXT). 
+* record_type: `{string}` - Type of the record (A, AAAA, CAA, CNAME, MX, NS, SRV, TXT).
 * data: `{string}` (optional) - Value of the record. (Useful in case of a hard-coded record or interpolation)
 * interpolate: `{boolean}` (optional) - When set to true, the application will write the current ip in the {ip} tag of the data field.
 
@@ -64,6 +67,3 @@ Example of use (with a given IP of 8.8.8.8) :
 }
 ```
 
-
-
-