To develop on this package, php >=5.6.0 is needed

ssfinney · ssfinney · commit ae07af798513 · 2018-03-16T15:10:55.000-04:00
diff --git a/composer.json b/composer.json
@@ -23,6 +23,7 @@
     },
     "require-dev": {
         "mockery/mockery": "~0.9",
+        "php": ">=5.6.0",
         "phpunit/phpunit": "~5.0",
         "psy/psysh": "^0.5.1",
         "satooshi/php-coveralls": "~1",
