Fix Process::__construct() must be of the type array, string given

Author: nafiesl

src/Laravel55ServiceProvider.php

@@ -97,7 +97,7 @@ private function registerCompressorProvider() {
      */
     private function registerShellProcessor() {
         $this->app->bind(\BackupManager\ShellProcessing\ShellProcessor::class, function () {
-            return new ShellProcessor(new Process('', null, null, null, null));
+            return new ShellProcessor(new Process([], null, null, null, null));
         });
     }