Update README.md

Author: andrewgiang

README.md

@@ -28,7 +28,7 @@ Add the library project (or just copy the files manually) and then insert the vi
     <com.wrapp.floatlabelededittext.FloatLabeledEditText
         android:layout_height="wrap_content"
         android:layout_width="match_parent"
-        float:floatingHint="Test"/>
+        float:fletFloatingHint="Test"/>
 </LinearLayout>
 ```
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