Add "static analysis" Composer keyword (Rarst#7)

Add "static analysis" Composer keyword

As per https://getcomposer.org/doc/04-schema.md#keywords by including "static analysis" as a keyword in the `composer.json` file, Composer 2.4.0-RC1 and later will prompt users if the package is installed with `composer require` instead of `composer require --dev`. See composer/composer#10960 for more info.

Author: GaryJones

composer.json

@@ -3,7 +3,8 @@
     "description": "Cognitive complexity implementation for PHP_CodeSniffer",
     "keywords"   : [
         "phpcs",
-        "standards"
+        "standards",
+        "static analysis"
     ],
     "type"       : "phpcodesniffer-standard",
     "license"    : "MIT",