README: fix header tags

Yoast / yoast-acf-analysis

WordPress plugin that adds the content of all ACF fields to the Yoast SEO score analysis.

GNU General Public License v3.0

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Closed jrfnl closed 6 years ago

jrfnl commented 6 years ago

This PR can be summarized in the following changelog entry:

The text-domain tag should be at the top of the plugin file, not the readme (where it already is).
Adds the new Requires PHP tag.