fix(sdk): fix metadata api

Author: CGjupoulton

engine/core/src/main/java/com/codingame/gameengine/core/GameManager.java

@@ -375,8 +375,8 @@ boolean getOuputsRead() {
      * @param value
      *            the property's value
      */
-    public final void putMetadata(String key, String value) {
-        metadata.put(key, value);
+    public final void putMetadata(String key, double value) {
+        metadata.put(key, String.valueOf(value));
     }
 
     /**

playground/misc/misc-3-release-notes.md

@@ -2,6 +2,13 @@
 
 The CodinGame SDK is regularly updated and improved. This document lets you know what changed in the latest releases.
 
+## Next version
+
+### 🐞 Bug fix
+
+- Removed "missing welcome_en.html file" warning.
+- Fixed the `putMetadata` function's signature
+
 ## 4.4.4
 
 ### 🐞 Bug fix