Added full namespace to exceptions (#528)

Author: Nyholm

src/Geocoder/Geocoder.php

@@ -28,7 +28,7 @@ interface Geocoder
      * @param string $value
      *
      * @return AddressCollection
-     * @throws Geocoder\Exception\Exception
+     * @throws \Geocoder\Exception\Exception
      */
     public function geocode($value);
 
@@ -39,7 +39,7 @@ public function geocode($value);
      * @param double $longitude
      *
      * @return AddressCollection
-     * @throws Geocoder\Exception\Exception
+     * @throws \Geocoder\Exception\Exception
      */
     public function reverse($latitude, $longitude);