Add GoDoc link

README.md

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 Go library for the [TOML](https://github.com/mojombo/toml) format.
 
 This library supports TOML version [e3656ad493400895f4460f1244a25f8f8e31a32a](https://github.com/mojombo/toml/tree/e3656ad493400895f4460f1244a25f8f8e31a32a)
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+
+[Documentation](http://godoc.org/github.com/pelletier/go-toml/src/toml)