Fix missing TargetApi import

The build was producing a "cannot find symbol class TargetApi" error without that line.

android/src/main/java/com/brentvatne/react/ReactVideoView.java

@@ -1,6 +1,7 @@
 package com.brentvatne.react;
 
 import android.annotation.SuppressLint;
+import android.annotation.TargetApi;
 import android.app.Activity;
 import android.content.res.AssetFileDescriptor;
 import android.graphics.Matrix;