Update improvmx so that it has an email field.

Author: iostpa

src/guides/improvmx.md

@@ -22,7 +22,8 @@ After you've made the file, you should put in the file this:
 ```json
 {
     "owner": {
-        "username": "github-username"
+        "username": "github-username",
+        "email": "[email protected]"
     },
     "record": {
         "MX": ["mx1.improvmx.com", "mx2.improvmx.com"],
@@ -35,4 +36,4 @@ After you've made the file, you should put in the file this:
 
 ## Configuring
 
-After it has been merged, it should be automatically recognized and should start working. If you haven't configured it beforehand, please go to the [ImprovMX dashboard](https://app.improvmx.com/) and add the domain there.
+After it has been merged, it should be automatically recognized and should start working. If you haven't configured it beforehand, please go to the [ImprovMX dashboard](https://app.improvmx.com/) and add the domain there.