docs(more badges)

README.md

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 A lightweight state management layer for Alpine.js
 
+![GitHub tag (latest by date)](https://img.shields.io/github/v/tag/ryangjchandler/spruce?label=version&style=flat-square)
 ![GitHub file size in bytes](https://img.shields.io/github/size/ryangjchandler/spruce/dist/spruce.js?label=min%20%28no%20gzip%29&style=flat-square)
 
 ## About