Update powered-by.md (#1871)
Update powered-by.md (#1871)

add user case Yonghui Superstores
OpenSkywalking/skywalking,ascrutae/sky-walking,apache/skywalking,apache/skywalking,ascrutae/sky-walking,apache/skywalking,ascrutae/sky-walking,apache/skywalking,OpenSkywalking/skywalking,apache/skywalking,ascrutae/sky-walking,apache/skywalking,apache/skywalking