Adds mbstring to dev required extensions

maciejlew · maciejlew · commit 51ee5dc8f05d · 2020-11-18T15:15:49.000+01:00
diff --git a/composer.json b/composer.json
@@ -25,6 +25,7 @@
         "guzzlehttp/psr7": "^1"
     },
     "require-dev": {
+        "ext-mbstring": "*",
         "phpunit/phpunit": "^6",
         "symfony/yaml": "^3",
         "marc-mabe/php-enum": "^3",
