explicitly specify PHP version requirements

Athlon1600 · Athlon1600 · commit e45e70d88ed8 · 2023-10-07T18:21:34.000-05:00
diff --git a/composer.json b/composer.json
@@ -4,6 +4,7 @@
   "keywords": ["php curl client"],
   "license": "MIT",
   "require": {
+    "php": "^7.3|^8.0",
     "ext-curl": "*",
     "ext-json": "*"
   },
