Update plugin header

[nielslange]

See https://wp-info.org/tools/checkplugini18n.php?slug=smntcs-disable-rest-api-user-endpoints:

• WARNING: You have both a readme.txt and readme.md . Only the .txt is taken into account.
• WARNING: Stable tag not found in readme file so defaulting to trunk, but better define it! More info Copy to clipboard
• WARNING: The plugin sources used by everyone are in /trunk, is this what is expected? More info Copy to clipboard
• RECOMMENDATION: Trunk is being used, but there is a folder under tags with the same name as your plugin version (1.3). This could lead to confusion Copy to clipboard
• RECOMMENDATION: The Domain Path header can be omitted as the plugin is in the official WordPress Plugin Directory. More info Copy to clipboard
• RECOMMENDATION: The GPL3+ license is not a standard abbreviation for a compatible license. You might have a compatible license but the correct abbreviation (e.g. GPLv2) is expected here... More info Copy to clipboard
• RECOMMENDATION: "Requires at least" (4.7) is at least 4.6 so no load_plugin_textdomain is needed. If you have the function somewhere, you can remove it. More info Copy to clipboard

[nielslange]

Fixed with 87f1f77 and 05efd98