v0.2.2

Changed:
MessageHelper::getAuthorizationHeader(MessageInterface $message) : ?AbstractAuthorizationHeader
To:
MessageHelper::getFirstAuthorizationHeader(MessageInterface $message) : ?AbstractAuthorizationHeader

v0.2.3

Refactor addAuthenticationScheme

v0.2.1

Updated AbstractAuthorizationHeader

v0.2.0

Fixes and Constants namespace.

v0.1.0

Added license attribute to package.