Update Currency.kt

Added an integer placeholder. I needed a placeholder that would strip the decimals and just use the integer value.

Figured I'd share in case you're interested.

eco-core/core-plugin/src/main/kotlin/com/willfp/ecobits/currencies/Currency.kt

@@ -139,6 +139,15 @@ class Currency(
             }
         )
 
+        PlaceholderManager.registerPlaceholder(
+            PlayerPlaceholder(
+                plugin,
+                "${id}_integer"
+            ) {
+                it.getBalance(this).toInt().toString()
+            }
+        )
+
         PlaceholderManager.registerPlaceholder(
             PlayerlessPlaceholder(
                 plugin,