altdoc 0.2.0

Breaking changes

• Vignettes are no longer automatically added to the file that defines the structure
  of the website. Developers must now manually update this structure and the order
  of their articles.

Major changes

• update_docs() now updates the package version as well as altdoc version in
  the footer.

• The NEWS or Changelog file included in the docs now automatically links issues,
  pull requests and users (only works for projects on Github).

• Vignettes are now always rendered by use_*() or update_docs(). Therefore,
  the argument convert_vignettes is removed. Previously, they were only rendered
  if their content changed. This was problematic because the code in a vignette
  can have different output while the vignette in itself doesn't change (#37, #38).

• New argument custom_reference in use_*() and update_docs(). If it is a
  path to a custom R file then it uses this file to build the "Reference" section
  in the docs (#35).

Minor changes

• Fix some CRAN failures.