v0.3.0

Features:

• The preferred_chain directive allows selecting alternative certificate chains.
• The profile directive allows specifying preferred certificate profile.
• Requesting certificates for IP addresses is now documented and officially supported.

Bugfixes:

• Directory metadata could not be parsed with certain fields set to null.
  Thanks to Marian Degel.
• Directory requests failed to handle HTTP redirects.
  Thanks to Marian Degel.
• Relative state_path was not using NGX_ACME_STATE_PREFIX.
• Build error with BoringSSL (via rust-openssl update).
• Build error on NetBSD 10 (via rust-openssl update).

New Contributors

• @mdegel made their first contribution in #74

Full Changelog: v0.2.0...v0.3.0