create bootstrap file for syncing parity to chain tip (v02)
Why? It has become near impossible to sync.
See issues
https://github.com/paritytech/parity/issues/8145
https://github.com/paritytech/parity/issues/7801#issuecomment-373922859
https://github.com/paritytech/parity/issues/8215#issuecomment-376553979
https://github.com/paritytech/parity/issues/8148#issuecomment-374600566