message: Typo fix, explain further cashlib, add graphene activation param
  [skip-ci]
diff: @@ -42,7 +42,7 @@ the rules activated Nov 13th 2017 and May 15th 2018 protocol upgrades.
  Main Changes
  ------------
  -- Graphene Relay: A protocol for efficiently relaying blocks across a blockchain's network (experimental, turned off by default)
  +- Graphene Relay: A protocol for efficiently relaying blocks across a blockchain's network (experimental, turned off by default, set `use-grapheneblocks=1` to turn it on)
  - blocksdb: Add leveldb as an alternative storage method for blocks and undo data (experimental, on-disk blocksdb data formats may change in subsequent releases, turned off by default)
  - Double Spend Relaying
  - BIP 135: Generalized version bits voting
  @@ -50,8 +50,8 @@ Main Changes
  - Update depends libraries
  - Rework of the Bitcoin fuzzer command line driver tool
  - Add stand alone cpu miner to the set of binaries
  -- Cashlib: create a shared library to make creating wallets easier
  -- Imporva QA machinery (travis mainly)
  +- Cashlib: create a shared library to make creating wallets easier (experimental, this library factors useful functionality out of bitcoind into a separate shared library that is callable from higher level languages. Currently supports transaction signing, additional functionality TBD)
  +- Improve QA machinery (travis mainly)
  - Port Hierarchical Deterministic wallet (BIP 32)
  - add space-efficient mining RPC calls that send only the block header, coinbase transaction, and merkle branch: getminingcandidate, submitminingsolution
  