Update version to 0.9.0 and modify HytaleMetrics interface

Author: NonSwag

gradle.properties

@@ -1 +1 @@
-version=0.8.1
+version=0.9.0

hytale/src/main/java/dev/faststats/hytale/HytaleMetrics.java

@@ -7,14 +7,14 @@
 /**
  * Hytale metrics implementation.
  *
- * @since 0.1.0
+ * @since 0.9.0
  */
 public sealed interface HytaleMetrics extends Metrics permits HytaleMetricsImpl {
     /**
      * Creates a new metrics factory for Hytale.
      *
      * @return the metrics factory
-     * @since 0.1.0
+     * @since 0.9.0
      */
     @Contract(pure = true)
     static Metrics.Factory<JavaPlugin> factory() {