Mark github releases as non preview

it's happening!

tools/beta-release/release.js

@@ -50,7 +50,7 @@ export const release = async (github, version, applicationId, artifacts, config)
         owner: config.owner,
         repo: config.repo,
         tag_name: version.name,
-        prerelease: true,
+        prerelease: false,
         generate_release_notes: true,
     })
 
@@ -219,4 +219,4 @@ const sendReleaseMessage = async (release, config) => {
         "msgtype": "m.text"
     }
     await client.sendEvent(config.matrixRoomId, "m.room.message", content, "")
-}
+}