Prebid 2.2.0 Release

🚀New Features

• New Bid Adapter richaudience (#3518)
• New Bid Adapter Admedia adapter (#3481)
• Prebid Server Adapter - support User ID module #3530

🛠Maintenance

• Zedo: Support new param in tag call (#3471)
• openxoutstream: update query params (#3509)
• Allow root configs when building with analytics (#3539)
• rtbhouse: Update rtbhouseBidAdapter.md doc (#3549)

🐛Bug Fixes

• fixes #3536 map video.playerSize to bid.sizes (#3537)
• checking usConfig.enableOverride value before returning (#3542)