Update phpstan and move it to require-dev

Author: marmichalski

composer.json

@@ -3,12 +3,12 @@
     "description": "Yii2 extension for PHPStan",
     "type": "library",
     "require": {
-        "php": "^7.1",
-        "phpstan/phpstan": "^0.10.3"
+        "php": "^7.1"
     },
     "require-dev": {
         "phpunit/phpunit": "^7.0",
-        "phpstan/phpstan-phpunit": "^0.10"
+        "phpstan/phpstan-phpunit": "^0.10",
+        "phpstan/phpstan": "^0.10.3"
     },
     "autoload": {
         "psr-4": {