Add explicit PHP version into composer.json

composer.json

@@ -3,6 +3,7 @@
     "license": "MIT",
     "description": "Send your app metrics to InfluxDB",
     "require": {
+         "php": ">=5.4",
          "guzzlehttp/guzzle": "~4|~5",
          "zendframework/zend-stdlib": "~2",
          "zendframework/zend-filter": "~2",

composer.lock

@@ -1,10 +1,10 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at http://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "43d7cf570f8cc52b5210875b97760120",
+    "hash": "f2dbbf00b528de2e350ff4550629e1b4",
     "packages": [
         {
             "name": "guzzlehttp/guzzle",
@@ -1170,12 +1170,12 @@
             "version": "v2.1.1",
             "source": {
                 "type": "git",
-                "url": "https://github.com/fabpot/Pimple.git",
+                "url": "https://github.com/silexphp/Pimple.git",
                 "reference": "ea22fb2880faf7b7b0e17c9809c6fe25b071fd76"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/fabpot/Pimple/zipball/ea22fb2880faf7b7b0e17c9809c6fe25b071fd76",
+                "url": "https://api.github.com/repos/silexphp/Pimple/zipball/ea22fb2880faf7b7b0e17c9809c6fe25b071fd76",
                 "reference": "ea22fb2880faf7b7b0e17c9809c6fe25b071fd76",
                 "shasum": ""
             },
@@ -1895,7 +1895,9 @@
     "stability-flags": [],
     "prefer-stable": false,
     "prefer-lowest": false,
-    "platform": [],
+    "platform": {
+        "php": ">=5.4"
+    },
     "platform-dev": {
         "ext-sockets": "*"
     }