Added WPSemantix to list of companies using Apache Superset in README.md file (#8045)
Added WPSemantix to list of companies using Apache Superset in README.md file (#8045)


airbnb/caravel,apache/incubator-superset,mistercrunch/panoramix,zhouyao1994/incubator-superset,apache/incubator-superset,apache/incubator-superset,zhouyao1994/incubator-superset,airbnb/caravel,airbnb/superset,zhouyao1994/incubator-superset,airbnb/superset,apache/incubator-superset,zhouyao1994/incubator-superset,airbnb/caravel,mistercrunch/panoramix,apache/incubator-superset,airbnb/superset,mistercrunch/panoramix,airbnb/caravel,zhouyao1994/incubator-superset,airbnb/superset,mistercrunch/panoramix