v1.0.0

Updated dependencies again for php7.3.
Moved from TravisCI to CircleCI.
EOL PHP 7.0

v0.3.0

Fixed problems with the composer.json file.

v0.2.0

• Made it so the fields defined in the sum types are publicly accessible to the user by their name.

v0.1.1: Update README.md

Updated docs to include installation instructions.

v0.1.0

Got the basics of Sum and Product Types.