Composer: add keywords to suggest --dev during require (#30)

Author: mabar

composer.json

@@ -2,6 +2,10 @@
 "name": "nextras/orm-phpstan",
 "description": "PHPStan extension for Nextras Orm",
 "type": "phpstan-extension",
+"keywords": [
+"dev",
+"static analysis"
+],
 "license": [
 "MIT"
 ],