Not seeing menu option to Change symbols to Library Symbol
Thanks for the contribution.

On the readme, I saw the item "Change symbols to Library Symbol", described as "Change the selected/all symbols to library symbol base on symbol ID.". This sounds like what I want to do in order to resolve [this problem](https://graphicdesign.stackexchange.com/q/101062/53953). 

But I'm not seeing this as an option from within the Sketch (version 47.1) menu. Here's what I see:
![screen shot 2017-11-08 at 10 46 51 am](https://user-images.githubusercontent.com/2223603/32558368-9261ff6e-c472-11e7-9efd-ac6449ebc55c.png)

How do I use this feature?