Add additional adapters to prebid

[kmwilkerson]

In an effort to expand the capability for publishers to add their own bidders with whom they have direct relationships, we'll continue to add more adapters over time. In our first batch of bidder additions, we'll add:

• OpenX
  • Required parameters:
  • platform (pub ID)
  • unit (placement ID)
• Pubmatic
  • Required parameters:
  • publisherId
• Sovrn
  • Required parameters:
  • tagid (placement ID)

[matticbot]

:tada: This issue has been resolved in version 1.27.0-alpha.1 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket:

[matticbot]

:tada: This issue has been resolved in version 1.27.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: