fix: send only application/json as content-type (#16)

* fix: send only application/json as content-type

* chore: 0.1.1 changelog

Author: faustbrian

CHANGELOG.md

@@ -7,5 +7,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## Unreleased
 
+## 0.1.1 - 2018-11-23
+
+### Changed:
+- Always send the `Content-Type` header
+
 ## 0.1.0 - 2018-10-08
 - Initial Release

src/main/java/org/arkecosystem/client/http/Client.java

@@ -12,7 +12,7 @@ public class Client {
     private String host;
     private int version;
     private OkHttpClient client;
-    private MediaType JSON = MediaType.parse("application/json charset=utf-8");
+    private MediaType JSON = MediaType.parse("application/json");
 
     public Client(String host, int version) {
         this.host = host;