Add custom url (#44)

* add custom_html_url parameter

* Update action.yml

* Update README.md

* Update test.yml

* fix: fixed embedMsg url property

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Co-authored-by: SethCohen <47002293+SethCohen@users.noreply.github.com>

action.yml

@@ -15,6 +15,9 @@ inputs:
   avatar_url:
     description: String url to webhook avatar picture.
     required: false
+  custom_html_url:
+    description: If filled, replaces github's release url with your custom html url.
+    required: false
   content:
     description: String content for webhook.
     required: false
@@ -44,4 +47,4 @@ runs:
   main: 'index.js'
 branding:
   icon: file-text
-  color: blue
+  color: blue