Use tagged PHPStan version

ezzatron · ezzatron · commit 5ac896a27c09 · 2020-08-29T12:24:10.000+10:00
diff --git a/composer.json b/composer.json
@@ -14,7 +14,7 @@
     "type": "phpstan-extension",
     "require": {
         "php": ">=7.2",
-        "phpstan/phpstan": "^0.12-dev"
+        "phpstan/phpstan": "^0.12"
     },
     "require-dev": {
         "eloquent/code-style": "^1",
