* Added CI for PHP 7.3
* Dropped CI for HHVM (was running into too many issues out of no where)
* Reworked CI distros where I could
* Bumped copyright year
* Cleaned up the README, fixed spacing, dumped some of the wordiness
Updated PHP versions to test against, copyright dates, dropped gittip,
cleaned up a bit of formatting to make more PSR-compliant and bumped the
version number slightly
Went back to dev-master, no need to specify a version (even though there is a formal release). Will leave that up to the dev to figure out if they need a specific version.