v0.7.2

Full Changelog

• Bump to Olm 2.0
  #309
• Sanity check payload length before encrypting
  #307
• Remove dead _sendPingToDevice function
  #308
• Add setRoomDirectoryVisibilityAppService
  #306
• Update release script to do signed releases
  #305
• e2e: Wait for pending device lists
  #304
• Start a new megolm session when devices are blacklisted
  #303
• E2E: Download our own devicelist on startup
  #302