v0.7.0

Added

• Add :max_retries option, to control how many times we should try
  to download a NIF artifact. By default it is going to try 3 times.
  To disable this feature, use the value 0.

• Add support for variants. This is a feature that enables building
  for the same target with multiple configurations. It can support
  different features or OS dependencies. The selection is done in
  compile time.

Changed

• Change default list of NIF versions to only include the version 2.15.
  This is because most of the users won't need to activate newer versions,
  unless they use features from those versions.

  This is going to simplify and speed up the release process for most of the
  projects.

Pull requests

• Add max_retries option by @philss in #57
• Make sure :nif_versions option is respect by @philss in #60
• Add support for variants targets by @philss in #61
• Change defaults for upcoming v0.7 by @philss in #58

Full Changelog: v0.6.2...v0.7.0