Allow inspection of sent messages

Merge pull request #5 from reyostallenberg/introspection-on-sent-message

Introspection on sent message

Security fix for swiftmailer

Merge pull request #4 from nickvanderzwet/update-swiftmailer

updated composer packages (including swiftmailer due an security issue)

Release 1.1.0

Changelog:

• Add the receiver determiner (#3)

Initial release

1.0.0

Updated dependencies to only be available in dev