Add link to PSR-7.

radarphp · Jul 30, 2020 · ebb3875 · ebb3875
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 # Radar
 
-Radar is a PSR-7 compliant [Action-Domain-Responder](http://pmjones.io/adr)
+Radar is a [PSR-7](https://www.php-fig.org/psr/psr-7/) compliant [Action-Domain-Responder](http://pmjones.io/adr)
 (ADR) system. While it may look like a micro-framework, it is more like a
 wrapper around the real core of your application domain.