Fix JVM visibility

Author: rekire

core/src/main/java/io/snabble/sdk/Coupons.kt

@@ -140,6 +140,7 @@ class Coupons (
     }
 
     // Visibility for Project class. Used for setting the data asap if on main thread
+    @JvmName("setInternalProjectCoupons")
     internal fun setProjectCoupons(coupons: List<Coupon>) {
         if (Looper.getMainLooper().thread.id == Thread.currentThread().id) {
             value = coupons

core/src/main/java/io/snabble/sdk/Project.java

@@ -318,7 +318,7 @@ void parse(JsonObject jsonObject) {
             Logger.e("Could not parse coupons");
         }
 
-        this.coupons.setProjectCoupons$core_debug(couponList); // call internal setProjectCoupons
+        this.coupons.setInternalProjectCoupons(couponList);
 
         notifyUpdate();
     }