add godotenv by joho

README.md

@@ -641,6 +641,7 @@ Join us on IRC at **#awesome-go** on freenode [web access](http://webchat.freeno
 * [go-dry](https://github.com/ungerik/go-dry) - DRY (don't repeat yourself) package for Go.
 * [go-underscore](https://github.com/tobyhede/go-underscore) - A useful collection of helpfully functional Go collection utilities.
 * [goback](https://github.com/carlescere/goback) - Go simple exponential backoff package.
+* [godotenv](https://github.com/joho/godotenv) - A Go port of Ruby's dotenv library (Loads environment variables from `.env`.)
 * [godropbox](https://github.com/dropbox/godropbox) - Common libraries for writing Go services/applications from Dropbox.
 * [gohper](https://github.com/cosiner/gohper) - Various tools/modules help for development.
 * [gopencils](https://github.com/bndr/gopencils) - Small and simple package to easily consume REST APIs.