v0.13.1

• Docker build can now fully run without a pre-existing development
  environment.
• Public Docker Image: https://hub.docker.com/r/curveballjs/a12n-server
• WebauthN and TOTP MFA are now enabled by default.
• No longer using unpkg for browser dependencies.
• Upgraded from hal-browser to @curveball/browser.
• Better error messaging in the OAuth2 flow when a redirect_uri is
  incorrect.