Merge pull request #13 from derheyne/master

Update composer.json to support Laravel 5.5 and 5.6.

Author: apictapx

composer.json

@@ -10,9 +10,9 @@
     }
   ],
   "require": {
-    "php": ">=5.6",
-    "illuminate/log": "5.2.*|5.3.*|5.4.*",
-    "illuminate/support": "5.2.*|5.3.*|5.4.*",
+    "php": "^5.6 || ^7.0 || ^7.1.3",
+    "illuminate/log": "5.2.*|5.3.*|5.4.*|5.5.*|5.6.*",
+    "illuminate/support": "5.2.*|5.3.*|5.4.*|5.5.*|5.6.*",
     "influxdb/influxdb-php": "1.14.*",
     "monolog/monolog": "^1.19"
   },