Add target to sentiment analysis

Author: Julien Salinas

README.md

@@ -318,7 +318,7 @@ The above command returns an object.
 Call the `question()` method and pass the following:
 
 1. Your question
-1. A context that the model will use to try to answer your question
+1. (Optional) A context that the model will use to try to answer your question
 
 ```php
 echo json_encode($client->question('<Your question>','<Your context>'));
@@ -358,10 +358,14 @@ The above command returns an object.
 
 ### Sentiment Analysis Endpoint
 
-Call the `sentiment()` method and pass the text you want to analyze the sentiment of:
+Call the `sentiment()` method and pass the following:
+
+1. The text you want to analyze and get the sentiment of
+1. (Optional) The target element that the sentiment should apply to
+
 
 ```php
-echo json_encode($client->sentiment('<Your block of text>'));
+echo json_encode($client->sentiment('<Your block of text>', '<Your target element>'));
 ```
 
 The above command returns an object.

src/NLPCloud.php

@@ -432,10 +432,11 @@ public function sentenceDependencies($text)
         return $response->body;
     }
 
-    public function sentiment($text)
+    public function sentiment($text, $target = NULL)
     {
         $payload = array(
-            'text' => $text
+            'text' => $text,
+            'target' => $target
         );
         $response = \Httpful\Request::post($this->rootURL . '/' . 'sentiment', $payload)
             ->expectsJson()