Removed puli, updated discovery, updated Crawl error message

Author: Swader

composer.json

@@ -21,8 +21,7 @@
     "php": "^5.6|7.*",
     "php-http/client-implementation": "^1.0",
     "php-http/client-common": "^1",
-    "php-http/discovery": "^0.8",
-    "puli/composer-plugin": "^1.0@beta",
+    "php-http/discovery": "^1",
     "php-http/message": "^1.0"
   },
   "require-dev": {

src/Api/Crawl.php

@@ -2,7 +2,7 @@
 
 namespace Swader\Diffbot\Api;
 
-use Doctrine\Instantiator\Exception\InvalidArgumentException;
+use \InvalidArgumentException;
 use Swader\Diffbot\Entity\EntityIterator;
 use Swader\Diffbot\Entity\JobCrawl;
 use Swader\Diffbot\Exceptions\DiffbotException;
@@ -454,7 +454,7 @@ public function call()
         } elseif (!isset($array['jobs']) && isset($array['response'])) {
             return $array['response'];
         } else {
-            throw new DiffbotException('It appears something went wrong.');
+            throw new DiffbotException('It appears something went wrong - no data was returned. Did you use the correct token / job name?');
         }
     }