Documentation and customization of styles mismatches implementation

[m1cm1c]

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The readme says to set go-add-tags-style to 'lower-camel-case for lower camel case (both in the list and in the sample configuration). Even the variable customization within emacs chooses this value. However, it doesn't work as already documented in #8 (new issue because that one got closed by the issue's author).

The value the implementation uses for lower camel case is 'camel-case: https://github.com/emacsorphanage/go-add-tags/blob/93ecde9f82bc960493eaf6921d46a5adc3699ffc/go-add-tags.el#L52