Add Gamoshi to the list of "Partners that work with Prebid" (#853)
Add Gamoshi to the list of "Partners that work with Prebid" (#853)

This commit adds Gamoshi to the list of "Partners that work with Prebid"
as the last partner in the list.
prebid/prebid.github.io,prebid/prebid.github.io,prebid/prebid.github.io,sonobi/prebid.github.io,sonobi/prebid.github.io,sonobi/prebid.github.io