Update composer for php 8.

Author: michaeldrennen

composer.json

@@ -11,7 +11,7 @@
     ],
     "minimum-stability": "stable",
     "require": {
-        "php": "^7.2",
+        "php": "^7.2||^8.0",
         "dprmc/cusip": "^1.0",
         "guzzlehttp/guzzle": "^6.3||^7.0",
         "psr/log": "^1.1",