Merge pull request #33 from ofiron01/master

use Nullable from AndroidX

Author: iyegoroff

android/src/main/java/iyegoroff/RNTextGradient/RNShadowTextGradient.java

@@ -16,7 +16,7 @@
 import com.facebook.react.uimanager.annotations.ReactProp;
 import java.lang.ref.WeakReference;
 
-import android.support.annotation.Nullable;
+import androidx.annotation.Nullable;
 import android.text.Editable;
 import android.text.Layout;
 import java.lang.String;

android/src/main/java/iyegoroff/RNTextGradient/ReflectUtils.java

@@ -1,6 +1,6 @@
 package iyegoroff.RNTextGradient;
 
-import android.support.annotation.Nullable;
+import androidx.annotation.Nullable;
 
 import com.facebook.common.logging.FLog;
 import com.facebook.react.common.ReactConstants;