Fix support for older php versions

Author: plotbox-io

composer.json

@@ -1,24 +1,27 @@
 {
-    "name": "tuck/sort",
-    "description": "Syntactic sugar for PHP's sorting",
-    "keywords": ["sort", "sorting"],
-    "license": "MIT",
-    "authors": [
-        {
-            "name": "Ross Tuck",
-            "email": "[email protected]"
-        }
-    ],
-    "require": {
-        "php": ">=7.0"
-    },
-    "require-dev": {
-        "phpunit/phpunit": "^6.5"
-    },
-    "autoload": {
-        "psr-4": {
-            "Tuck\\Sort\\": "src/",
-            "Tuck\\Sort\\Tests\\": "tests/"
-        }
+  "name": "tuck/sort",
+  "description": "Syntactic sugar for PHP's sorting",
+  "keywords": [
+    "sort",
+    "sorting"
+  ],
+  "license": "MIT",
+  "platform": {
+    "php": "5.5"
+  },
+  "authors": [
+    {
+      "name": "Ross Tuck",
+      "email": "[email protected]"
     }
+  ],
+  "require": {
+    "php": ">=5.5"
+  },
+  "autoload": {
+    "psr-4": {
+      "Tuck\\Sort\\": "src/",
+      "Tuck\\Sort\\Tests\\": "tests/"
+    }
+  }
 }