Support for PHP7.2 and PHP7.3

#3

• Drop support for PHP 5
• Add support for PHP 7.2 and PHP 7.3
• Update to PHPUnit5.7.11

CI updates and style fixes

• Add .editorconfig to unify style 6e3bf5a
• Drop HHVM from CI f70fe0c
• Fix indent style for YAML files 97a7d9c
• Fix wrong case for class name 7246b26

0.1.3: Test on more PHP versions

See #1 for more details.

0.1.2

Update dependancies

Update docs and tests

0.1.1

fix scrutinizer

Initial

0.1.0

Initial