Release gtfs2emis v0.1.0

[Joaobazzo]

Prepare for release:

• [x] Check [current CRAN check results](add link)
• [x] Polish NEWS
• [x] Draft new Zenodo version
• [x] Edit citation file
• [x] Update README (rerender and Zotero badge)
• [x] urlchecker::url_check() (will return that DOI links are not found, justify that on cran comments)
• [x] devtools::check(remote = TRUE, manual = TRUE)
• [x] devtools::check_win_oldrelease()
• [x] devtools::check_win_release()
• [x] devtools::check_win_devel()
• [x] rhub::check_for_cran(show_status = FALSE)
• [x] Update cran-comments.md

Submit to CRAN:

• [x] Bump minor version
• [x] Commit changes "v0.1.0 release"
• [x] devtools::submit_cran()

• [x] Approve email

  Wait for CRAN...

• [x] Accepted
• [x] Submit tarball to Zenodo and review publication date
• [x] Create git tag and push
• [x] Create github release
• [x] Tweet about it?
• [x] Bump dev version