Release signet 0.13.0

• Support Faraday 1.x

v0.12.0

• This version now requires Ruby 2.4.
• Support array values of the "aud" field.
• Normalize the version constant to match related gems.

v0.11.0

• Add constant time comparison for oauth signatures.

v0.10.0

• Add UnexpectedStatusError class for http status errors that are not handled.

v0.9.2

• Update issued_at correctly when it is set simultaneously with expires_in.

v0.9.1

• Warn on EOL ruby versions.
• Fix DateTime normalization.

v0.9.0

• Add RemoteServerError class for 5xx level errors.
• Allow to_json to be called with arguments
• Expires_in now sets and reflects current expires_at value
• Expires_within(0) now returns false when expires_at is nil.