Merge pull request #3 from revinate/php7.4-compat

PHP 7.4 compatibility

.travis.yml

@@ -2,7 +2,5 @@ language: php
 install:
   composer install
 php:
-  - 5.3
-  - 5.4
-  - 5.5
-  - 5.6
+  - 7.1
+  - 7.4

composer.json

@@ -1,24 +1,29 @@
 {
-    "name": "revinate/php-getter-setter",
-    "description": "PHP library to simplify getting and setting values in arrays and objects.",
-    "autoload": {
-        "psr-4": {
-            "Revinate\\GetterSetter\\": "src",
-            "Revinate\\GetterSetter\\test\\": "test"
-        },
-        "files": [ "src/getValueFunctions.php", "src/setValueFunctions.php", "src/util/utils.php" ]
+  "name": "revinate/php-getter-setter",
+  "description": "PHP library to simplify getting and setting values in arrays and objects.",
+  "autoload": {
+    "psr-4": {
+      "Revinate\\GetterSetter\\": "src",
+      "Revinate\\GetterSetter\\test\\": "test"
     },
-    "require": {
-        "php": ">=5.3.3"
-    },
-    "require-dev": {
-        "phpunit/phpunit": "^4.8"
-    },
-    "license": "MIT",
-    "authors": [
-        {
-            "name": "Jason Dent",
-            "email": "jason@revinate.com"
-        }
+    "files": [
+      "src/getValueFunctions.php",
+      "src/setValueFunctions.php",
+      "src/util/utils.php"
     ]
+  },
+  "require": {
+    "php": ">=7",
+    "ext-json": "*"
+  },
+  "require-dev": {
+    "phpunit/phpunit": "^6"
+  },
+  "license": "MIT",
+  "authors": [
+    {
+      "name": "Jason Dent",
+      "email": "jason@revinate.com"
+    }
+  ]
 }