Added orchestra, updated private key location

Author: IlCallo

composer.json

@@ -18,13 +18,14 @@
         }
     ],
     "require": {
-        "php" : "^7.0",
-        "illuminate/support": "~5.4.0|~5.5.0",
+        "php" : "^7.1",
+        "illuminate/support": "~5.5.0",
         "aws/aws-sdk-php": "^3.52",
         "league/uri": "^5.2"
     },
     "require-dev": {
-        "phpunit/phpunit" : "6.3"
+        "orchestra/testbench": "~3.4.4|~3.5.0|~3.6.0",
+        "phpunit/phpunit" : "^6.3|^7.0"
     },
     "autoload": {
         "psr-4": {