 Add a Gitter chat badge to README.md
 Add a Gitter chat badge to README.md
geopython/GeoHealthCheck,justb4/GeoHealthCheck,tomkralidis/GeoHealthCheck,tomkralidis/GeoHealthCheck,justb4/GeoHealthCheck,justb4/GeoHealthCheck,tomkralidis/GeoHealthCheck,justb4/GeoHealthCheck,geopython/GeoHealthCheck,geopython/GeoHealthCheck,tomkralidis/GeoHealthCheck,geopython/GeoHealthCheck