Fix typo

src/main/java/com/kdanmobile/admanager/AdManager.kt

@@ -26,5 +26,5 @@ interface AdManager {
     fun unregisterNativeAdListener(nativeAdListener: NativeAdListener)
     fun requestNative(adUnitId: String, nativeAdViewBinder: NativeAdViewBinder)
     fun takeNativeAdView(adUnitId: String, nativeAdViewBinder: NativeAdViewBinder): View?
-    fun isNatvieLoading(adUnitId: String): Boolean
+    fun isNativeLoading(adUnitId: String): Boolean
 }

src/main/java/com/kdanmobile/admanager/admob/AdmobAdManager.kt

@@ -82,7 +82,7 @@ class AdmobAdManager : AdManager {
         return nativeAdManager.takeAdView(adUnitId, nativeAdViewBinder)
     }
 
-    override fun isNatvieLoading(adUnitId: String): Boolean {
+    override fun isNativeLoading(adUnitId: String): Boolean {
         return nativeAdManager.isLoading(adUnitId)
     }
 }

src/main/java/com/kdanmobile/admanager/mopub/MoPubAdManager.kt

@@ -87,7 +87,7 @@ class MoPubAdManager : AdManager {
         return nativeAdManager.takeAdView(adUnitId, nativeAdViewBinder)
     }
 
-    override fun isNatvieLoading(adUnitId: String): Boolean {
+    override fun isNativeLoading(adUnitId: String): Boolean {
         return nativeAdManager.isLoading(adUnitId)
     }
 }