Single Quotes for Version Number

Per the Custom Ink food critic rules: [https://github.com/customink-webops/foodcritic-rules/blob/master/rules.rb](https://github.com/customink-webops/foodcritic-rules/blob/master/rules.rb)

`rule 'CINK002', 'Prefer single-quoted strings'...`

All I did was change the double quotes to single quotes in the bump command. Call it nit picky, but I think this and the Etsy rule set are gaining popularity, and it is a bummer to have to use spork bump and then go into the metadata file to change the quotes back.