Don't send in for a first time

src/Reviewer.php

@@ -27,6 +27,13 @@ class Reviewer
      */
     protected $appId;
 
+    /**
+     * Is sending fired for a first time
+     *
+     * @var boolean
+     */
+    protected $firstTime = false;
+
     /**
      * Exception cathced during the initialization
      *
@@ -82,6 +89,10 @@ public function __construct($appId)
             throw new Exception("Please make '{$databaseDir}' dir writable");
         }
 
+        if (!file_exists($databaseDir . '/reviews.dat')) {
+            $this->firstTime = true;
+        }
+
         try {
             $this->storage = Flintstone::load('reviews', ['dir' => $databaseDir]);
         } catch (FlintstoneException $e) {
@@ -233,7 +244,9 @@ public function sendReviews($reviews)
                     ]
                 ]);
 
-                $slack->send();
+                if ($this->firstTime === true) {
+                    $slack->send();
+                }
 
                 $this->storage->set("r{$review['id']}", 1);
             } catch (Exception $e) {