docs: 📝 Documentation Updated

Author: uttamukkoji

CHANGELOG.md

@@ -2,6 +2,15 @@
 ## CHANGELOG
 ------------------------------------------------
 
+## Version 2.0.0
+###### Date: 02-Apr-2021
+### New Feature
+ - Sync API support added
+### Enhancement
+ - Added PSR 4 Standardized implementation.
+
+------------------------------------------------
+
 ## Version 1.8.1
 ###### Date: 17-Mar-2021
 ### Bug Fix

README.md

@@ -24,8 +24,14 @@ To initialize the SDK, you will need to specify the API Key, Delivery Token, and
 use Contentstack\Contentstack;
 $stack = Contentstack::Stack(API_KEY, DELIVERY_TOKEN, ENV_NAME);
 ```
+For Setting the European Region:
+If you want to set and use European region, refer to the code below:
 
-
+```php
+use Contentstack\Contentstack;
+use Contentstack\ContentstackRegion;
+$stack = Contentstack::Stack(API_KEY, DELIVERY_TOKEN, ENV_NAME, array('region'=> ContentstackRegion.EU));
+```
 #### Download and install library:
 To use the PHP SDK, you need to perform the following steps:
 

src/Config/index.php

@@ -25,3 +25,4 @@
 define('ENTRIES', '/entries/');
 define('ASSETS', '/assets/');
 define('ENVIRONMENTS', '/environments/');
+define('SYNC', '/stacks/sync/');

src/Stack/Stack.php

@@ -65,7 +65,7 @@ public function __construct(
             'stack', array('api_key' => $api_key, 
             'access_token' => $delivery_token, 
             'environment' => $environment, 
-            'region' => $config['region'])
+            'region' => $config['region'] ?? '')
         );
         $this->environment = $this->header['environment'];
         unset($this->header['environment']);