[R-package] Add additional linters to CI

[jameslamb]

Linting for the R code in this project was introduced in #2437 . As of that PR, the following linters from the lintr project were not available from the distribution of lintr on CRAN.

github_only_linters <- list(
    "equals_na" = lintr::equals_na_linter
    , "function_left" = lintr::function_left_parentheses_linter
    , "implicit_integers" = lintr::implicit_integer_linter
    , "paren_brace_linter" = lintr::paren_brace_linter
    , "semiconlon" = lintr::semicolon_terminator_linter
    , "seq" = lintr::seq_linter
    , "todo_comments" = lintr::todo_comment_linter
    , "true_false" = lintr::T_and_F_symbol_linter
)

To close this issue, add those linters to .ci/lint_r_code.R once lintr does a new release (> 1.0.3) to CRAN.

[jameslamb]

Closing in favor of being in #2302 with other feature requests. If you'd like to submit a PR to address this, re-open the issue.

[jameslamb]

Since we use r-lintr distribution from conda (not CRAN), to complete this issue it may also be necessary to make a pull request to https://github.com/conda-forge/r-lintr-feedstock to get r-lintr feedstock updated.

[jameslamb]

it seems that lintr did a release on October 1, 2019! I am going to re-open this issue and pick it up tonight or tomorrow.

[jameslamb]

and they updated the conda feedstock for r-lintr 🙌

Seems that project has a bot that automatically opens a PR when a new version makes it to CRAN (or maybe when a new release is created on jimhester/lintr).

Either way, should be able to address this issue now!