docs/Gopkg.toml.md: fix toml example

golang / dep

Go dependency management tool experiment (deprecated)

https://golang.github.io/dep/

BSD 3-Clause "New" or "Revised" License

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Closed kevinburke closed 5 years ago

kevinburke commented 5 years ago

Previously the provided Gopkg.toml is not valid. Thanks @liurui-1 for spotting the error.

Fixes #2174.