[R-package] fix typo in R installation instructions

[daviddalpiaz]

Fixes typo to allow for copy-paste installation of R package.

[jameslamb]

@daviddalpiaz thanks for using LightGBM and for contributing here! Sorry, but this issue you've found is my mistake. Our goal was to make all of the artifact names kebob case (lightgbm-{version}-r-cran.tar.gz), but since we haven't done #3283 I'm making them manually, and made a mistake.

I just uploaded the 3.0.0rc1 release with the kebob-case name, so the instructions will be correct. I left the snake_case one up there to not break anyone's code.

Now that we've released 3.0.0, could you change this PR to reference version 3.0.0?

https://github.com/microsoft/LightGBM/releases/download/v3.0.0/lightgbm-3.0.0-r-cran.tar.gz

[daviddalpiaz]

Huh. I could have sworn in looked for the R release of 3.0.0, but guess I missed it! Thanks for all the hard work. Hoping for CRAN soon so I can encourage my students to use LightGBM!

[jameslamb]

Huh. I could have sworn in looked for the R release of 3.0.0, but guess I missed it! Thanks for all the hard work. Hoping for CRAN soon so I can encourage my students to use LightGBM!

I just added it last night 😀

we are so so so close to CRAN, I can't wait til we don't have to make people deal with this. Thanks for being patient with us, for using LightGBM, and for coming here to contribute!

[jameslamb]

looks good! I'll merge this as soon as it builds

[daviddalpiaz]

Excellent! Thanks again!

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