message: chore: yank v0.27.1 and add v0.28.0 in CHANGELOG
diff: -# [v0.27.1](https://github.com/nervosnetwork/ckb/compare/v0.27.0...v0.27.1) (2020-01-31)
  +# [v0.28.0](https://github.com/nervosnetwork/ckb/compare/v0.27.0...v0.28.0) (2020-01-31)
  +
  +### Breaking Changes
  +
  +* #1879: add `outputs_validator` to `send_transaction` rpc (@quake)
  ### Features
  * #1900: Add RPC subscription, a.k.a, pub/sub (@quake)
  * #1908: Periodically disconnect peers which open invalid sub-protocols (@jjyr)
  -* #1879: add `outputs_validator` to `send_transaction` rpc (@quake)
  # [v0.27.0](https://github.com/nervosnetwork/ckb/compare/v0.26.1...v0.27.0) (2020-01-10)
  