Made Android AUTOFOCUS feature optional to improve device compatibility (#1)

Author: tjwoon

plugin.xml

@@ -31,7 +31,7 @@
         </config-file>
         <config-file target="AndroidManifest.xml" parent="/*">
             <uses-feature android:name="android.hardware.camera" />
-            <uses-feature android:name="android.hardware.camera.autofocus" />
+            <uses-feature android:name="android.hardware.camera.autofocus" android:required="false" />
             <uses-feature android:name="android.hardware.camera.flash" android:required="false" />
             <uses-feature android:name="android.hardware.camera.front" android:required="false" />
             <uses-permission android:name="android.permission.CAMERA" />