fix: always send the content-type header (#20)

* fix: always send the content-type header

* chore: 0.1.4 changelog

Author: faustbrian

CHANGELOG.md

@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## Unreleased
 
+## 0.1.4 - 2018-11-23
+
+### Changed:
+
+- Always send the `Content-Type` header
+
 ## 0.1.3 - 2018-10-31
 
 ### Fixed:

src/Connection.php

@@ -58,6 +58,7 @@ public function __construct(array $config, Builder $httpClientBuilder = null)
         $this->httpClientBuilder->addPlugin(new Plugin\BaseUriPlugin(UriFactoryDiscovery::find()->createUri($config['host'])));
         $this->httpClientBuilder->addPlugin(new Plugin\HeaderDefaultsPlugin([
             'User-Agent' => 'ark-php-client (https://github.com/ArkEcosystem/php-client)',
+            'Content-Type' => 'application/json'
         ]));
 
         $this->httpClientBuilder->addHeaderValue('API-Version', $config['version']);