Checklist before submitting to CRAN

Directions for use

Create an appropriately named issue (e.g., "Release package version version.").
Copy-paste this file into the issue text to provide the checklist functionality.
After a commit directly pursuant to a checkbox item, uncheck all checkboxes below it.
After any other commit to master branch, uncheck all boxes from the "master branch" section down.
After any other commit to *release* branch, uncheck boxes from the "Release branch" section down.
Close the issue after all boxes are checked.

[x] DESCRIPTION: Package's CRAN dependencies require the latest CRAN versions (unless you are certain that they don't).
[x] DESCRIPTION: Package's dependencies that are shipped with R (base, datasets, grDevices, methods, splines, stats4, tools, utils, compiler, graphics, grid, parallel, stats, tcltk, translations) do not specify a version.
[x] All tickets associated with the release's milestone have been resolved.
[x] Roxygen has been run on the package since last commit to code, documentation, or DESCRIPTION.
[x] Relevant tutorials run satisfactorily.
[x] inst/NEWS.Rd: file is up to date: none of the commits since the last commit to explicitly mention updating the NEWS file are newsworthy.
[x] LICENSE: license refers to the correct package.
[x] LICENSE: affiliations are up to date.
[x] LICENSE: copyright year range is correct.
[x] All files that should have them have copyright headers. Generally, it never hurts to rerun addcopyheaders to ensure this.

[x] Release branch has had the latest master merged into it. (git checkout *release*; git merge master)
[x] .travis.yml: Travis CI tests against CRAN and not repositories (unless releasing simultaneously).
[x] .travis.yml: warnings_are_errors: true is set (or warnings_are_errors is unset, since true is the default).
[x] DESCRIPTION: Release branch's version number does not have commit number attached to it.
[x] DESCRIPTION: Date is today.
[x] CITATION: update_CITATION has been run after installing all the mentioned packages from the release branch.
[x] All files in the release branch have been committed and pushed to GitHub.
[x] *pkg*.tar.gz: the candidate submission file is from the latest version of the release branch.
[x] *pkg*.tar.gz: R CMD check passes with ENABLE_statnet_TESTS=yes environment variable and --run-donttest.
[x] *pkg*.tar.gz: R CMD check passes with --as-cran option without WARNINGs.
[x] *pkg*.tar.gz: R CMD check passes Win-Builder (https://win-builder.r-project.org).

[x] Release branch corresponding to the package on CRAN has been tagged with the exact CRAN version and pushed to GitHub.