message: Update OP_DATASIGVERIFY specification
  Namely update estimate of deployment and the URL that point to a full
  implementation.
  [ci skip]
diff: @@ -8,7 +8,7 @@ OP_DATASIGVERIFY allows signed data to be imported into a script. This data can
  ## Requirements on miners, full nodes, and clients
  -Miners, full nodes, and clients will implement the OP_DATASIGVERIFY opcode and activate it during the May 2018 hard fork.
  +Miners, full nodes, and clients will probably implement the OP_DATASIGVERIFY opcode and activate it during the Nov 2018 hard fork.
  ## OP_DATASIGVERIFY Specification
  @@ -76,7 +76,7 @@ else-branch spend: `z' y' 0`
  ## Reference Implementation
  -Please refer to [this github branch](https://github.com/gandrewstone/BitcoinUnlimited/tree/op_datasigverify) for a complete implementation. Implementation is in src/test/interpreter.cpp/h and unit tests are located at src/test/script_tests.cpp.
  +Please refer to [this github commit](https://github.com/BitcoinUnlimited/BitcoinUnlimited/commit/1bf53307cab5d96076721ef5a238a63b03aca07d) for a complete implementation. Implementation is in src/test/interpreter.{cpp,h} and unit tests are located at src/test/script_tests.cpp.
  The opcode implementation is short enough to include here:
  ```c++
  