Require extension as --dev

ondrejmirtes · ondrejmirtes · commit 598ed4323250 · 2017-01-22T09:50:17.000+01:00
diff --git a/README.md b/README.md
@@ -14,7 +14,7 @@ This extension defines dynamic methods on `Dibi\Fluent` instance. They are calle
 To use this extension, require it in [Composer](https://getcomposer.org/):
 
 ```
-composer require phpstan/phpstan-dibi
+composer require --dev phpstan/phpstan-dibi
 ```
 
 And include extension.neon in your project's PHPStan config:
