Update supported Laravel verison (#15)

* drop dev requirements

* only support laravel 5.8 and 6.x

* removed deprecated method

* remove unused construct

* added support for 5.5 up to 6.x, reinclude testbench for autocomplete

composer.json

@@ -18,12 +18,12 @@
     "require": {
         "php": ">=5.6.0",
         "botman/botman": "~2.0",
-        "clue/stdio-react": "~1.1.0 | ^2.0",
-        "illuminate/support": "~5.0"
+        "clue/stdio-react": "^2.0",
+        "illuminate/support": "~5.5.0 || ~5.6.0 || ~5.7.0 || ~5.8.0 || ^6.0",
+        "illuminate/console": "~5.5.0 || ~5.6.0 || ~5.7.0 || ~5.8.0 || ^6.0"
     },
     "require-dev": {
-        "orchestra/testbench": "~3.0",
-        "phpunit/phpunit": "~5.0"
+        "orchestra/testbench": "^3.5 || ^3.6 || ^3.7 || ^3.8 || ^4.0"
     },
     "autoload": {
         "psr-4": {

src/Commands/Tinker.php

@@ -25,16 +25,6 @@ class Tinker extends Command
      */
     protected $description = 'Tinker around with BotMan.';
 
-    /**
-     * Create a new command instance.
-     *
-     * @return void
-     */
-    public function __construct()
-    {
-        parent::__construct();
-    }
-
     /**
      * Execute the console command.
      *
@@ -51,7 +41,7 @@ public function handle()
             $botman = BotManFactory::create($config, new ArrayCache());
 
             $stdio = new Stdio($loop);
-            $stdio->getReadline()->setPrompt('You: ');
+            $stdio->setPrompt('You: ');
 
             $botman->setDriver(new ConsoleDriver($config, $stdio));