Simplify composer dependencies versions

Author: gregoriohc

composer.json

@@ -14,10 +14,10 @@
     "require": {
         "php": ">=5.5.9",
         "twilio/sdk": "~5.16",
-        "illuminate/notifications": "5.1.*|5.2.*|5.3.*|5.4.*|5.5.*|5.6.*|5.7.*|5.8.*",
-        "illuminate/support": "5.1.*|5.2.*|5.3.*|5.4.*|5.5.*|5.6.*|5.7.*|5.8.*",
-        "illuminate/events": "5.1.*|5.2.*|5.3.*|5.4.*|5.5.*|5.6.*|5.7.*|5.8.*",
-        "illuminate/queue": "5.1.*|5.2.*|5.3.*|5.4.*|5.5.*|5.6.*|5.7.*|5.8.*"
+        "illuminate/notifications": "^5.1",
+        "illuminate/support": "^5.1",
+        "illuminate/events": "^5.1",
+        "illuminate/queue": "^5.1"
     },
     "require-dev": {
         "mockery/mockery": "^0.9.5",