Add support androidX

android/build.gradle

@@ -22,6 +22,8 @@ android {
 }
 
 dependencies {
-    compile fileTree(include: ['*.jar'], dir: 'libs')
-    compile 'com.facebook.react:react-native:+'
+    implementation fileTree(include: ['*.jar'], dir: 'libs')
+    implementation 'com.facebook.react:react-native:+'
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.annotation:annotation:1.0.2'
 }

android/src/main/java/com/beefe/picker/PickerViewModule.java

@@ -6,7 +6,7 @@ import android.app.Dialog;
 import android.graphics.Color;
 import android.graphics.PixelFormat;
 import android.graphics.Typeface;
-import android.support.annotation.Nullable;
+import androidx.annotation.Nullable;
 import android.text.TextUtils;
 import android.view.Gravity;
 import android.view.View;