Fixes issue with odd behaviour with initial value.

Author: dorantor

src/AbstractCounter.php

@@ -74,7 +74,7 @@ public function inc($step = 1)
         return $this->client->increment(
             $this->getKey(),
             $step,
-            $this->getInitialValue(),
+            $this->getInitialValue() + 1,
             $this->getExpiry()
         );
     }
@@ -138,4 +138,4 @@ protected function getExpiry()
      * @return string
      */
     abstract protected function getKey();
-}
+}