Update composer.json

Author: rgodiyal

composer.json

@@ -3,6 +3,15 @@
     "description": "Latest OAuth 2.0 Rest API Wrapper for UPS web services",
     "type": "library",
     "license": "MIT",
+    "keywords": [
+        "ups",
+        "api",
+        "wrapper",
+        "tracking",
+        "shipping",
+        "address validation",
+        "oauth 2.0"
+    ],
     "autoload": {
         "psr-4": {
             "RahulGodiyal\\PhpUpsApiWrapper\\": "src/"
@@ -16,5 +25,7 @@
     ],
     "readme": "readme.md",
     "minimum-stability": "stable",
-    "require": {}
+    "require": {
+        "php": "^7.4 || ^8.0",
+    }
 }