Merge pull request #45 from doesntmattr/fix/composer-2-lowercase-requirement

Packagist will not update until composer.json is all lowercase

Author: caciobanu

composer.json

@@ -22,7 +22,7 @@
     "require-dev": {
         "phpunit/phpunit": "^7.0",
         "friendsofphp/php-cs-fixer": "^2.0",
-        "mikey179/vfsStream": "1.*"
+        "mikey179/vfsstream": "1.*"
     },
     "autoload": {
         "psr-4": {