Constrain dependency versions

Author: ivanvermeyen

composer.json

@@ -15,12 +15,12 @@
         }
     ],
     "require": {
-        "php": ">=7.1",
+        "php": "^7.1",
         "codezero/dotenv-updater": "^1.1",
-        "illuminate/support": ">=5.7"
+        "illuminate/support": "^5.7|^6.0"
     },
     "require-dev": {
-        "orchestra/testbench": ">=3.7",
+        "orchestra/testbench": "^3.7|^4.0",
         "phpunit/phpunit": "^7.0|^8.0"
     },
     "scripts": {