Feature request: Using paddy in combo with Google Sheet Content Sync
### Feature request / enhancement

I'm trying to create a design which grabs the [content from a google sheet](https://github.com/DWilliames/Google-sheets-content-sync-sketch-plugin) and paddy updates the layout. So far so good, I found only one issue here...

When I create a button symbol with a # variable for the button text it works. The background with a defined padding also works.
![button-text-variable](https://user-images.githubusercontent.com/8168202/37606745-82860b5e-2b96-11e8-827b-2e74518009aa.png)

I now want to use the button symbols with different content from the google sheet sync plugin.
![screen shot 2018-03-19 at 16 59 31](https://user-images.githubusercontent.com/8168202/37606965-074ecbf0-2b97-11e8-8ef1-4dfd89867645.png)

That also works. But when I get the content from the sheet it updates the symbols content with the .1 and .2 as intended.
![screen shot 2018-03-19 at 17 02 33](https://user-images.githubusercontent.com/8168202/37607158-8b5f789a-2b97-11e8-8b45-062cf1041437.png)

Only it updates the original content of the symbol as well, without changing the width of the symbol.
![screen shot 2018-03-19 at 17 04 21](https://user-images.githubusercontent.com/8168202/37607171-96309c36-2b97-11e8-9c4f-3522e48bfd1e.png)

This is why the margins between the buttons is not working like I would expect.

For now I can fix this by using a "default" value for the symbol button in my google sheet so the width of the symbol is always the same as the content.

Not sure if this is the right place, but combining both plugins would be a awesome thing to do!!