Update composer.json (#23)

Author: tomschlick

composer.json

@@ -6,14 +6,14 @@
   "authors": [
     {
       "name": "Tom Schlick",
-      "email": "tom@tomschlick.com"
+      "email": "tom@schlick.email"
     }
   ],
   "require": {
     "php": ">=7.0",
-    "illuminate/contracts": "5.1.*|5.2.*|5.3.*|5.4.*|5.5.*|5.6.*|5.7.*",
-    "illuminate/support": "5.1.*|5.2.*|5.3.*|5.4.*|5.5.*|5.6.*|5.7.*",
-    "illuminate/http": "5.1.*|5.2.*|5.3.*|5.4.*|5.5.*|5.6.*|5.7.*"
+    "illuminate/contracts": "^5.1.",
+    "illuminate/support": "^5.1",
+    "illuminate/http": "^5.1"
   },
   "require-dev": {
     "phpunit/phpunit": "^5.4",