0.16.4
handler: Adds PKCE implementation for none and S256 (#246) This patch adds support for PKCE (https://tools.ietf.org/html/rfc7636) which is used by native apps (mobile) and prevents eavesdropping attacks against authorization codes. PKCE is enabled by default but not enforced. Challenge method plain is disabled by default. Both settings can be changed using `compose.Config.EnforcePKCE` and `compose.config.EnablePKCEPlainChallengeMethod`. Closes #213