use symfony polyfill for mbstring php extension

alexander-schranz · web-flow · commit 896cd181e816 · 2018-02-08T10:22:32.000+01:00
diff --git a/composer.json b/composer.json
@@ -20,7 +20,7 @@
     ],
     "require": {
         "php": ">=5.3.2",
-        "ext-mbstring": "*"
+        "symfony/polyfill-mbstring": "^1.0"
     },
     "require-dev": {
         "phpunit/phpunit": "3.7.*",
