ICM: Updated ninja mutex version.

Author: dmitry-ivanov

composer.json

@@ -12,7 +12,7 @@
     "require": {
         "php": ">=5.6.4",
         "illuminate/console": "^5.2",
-        "arvenil/ninja-mutex": "^0.5.1"
+        "arvenil/ninja-mutex": "^0.6.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^5.6",