Release v3.3.0

Added

• Allow costume accept headers for GraphQL Endpoint. (Necmttn) #1001
• Add endpoint for approve workflow run (Nyholm) #1006

Changed

• Update readme and add example for different http client usage (acrobat) #1002
• Bumped branch alias after new feature merged (GrahamCampbell) #1004
• Add comment on AbstractApi::$perPage() (Nyholm) #1007

Fixed

• Fix publicKey (Yurunsoft) #1005