Use PHP 7.3 for testing various topologies
Use PHP 7.3 for testing various topologies

10gen-labs/mongo-php-library-prototype,jmikola/mongo-php-library,mongodb/mongo-php-library,jmikola/mongo-php-library,jmikola/mongo-php-library,mongodb/mongo-php-library,mongodb/mongo-php-library,mongodb/mongo-php-library,jmikola/mongo-php-library,jmikola/mongo-php-library-prototype