message: Doccument the minimum boost version bump
diff: @@ -6,7 +6,7 @@ These are the dependencies currently used by PIVX Core. You can find instruction
  | Dependency | Version used | Minimum required | CVEs | Shared | [Bundled Qt library](https://doc.qt.io/qt-5/configure-options.html#third-party-libraries) |
  | --- | --- | --- | --- | --- | --- |
  | Berkeley DB | [4.8.30](https://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html) | 4.8.x | No | | |
  -| Boost | [1.64.0](https://www.boost.org/users/download/) | [1.47.0](https://github.com/bitcoin/bitcoin/pull/8920) | No | | |
  +| Boost | [1.64.0](https://www.boost.org/users/download/) | [1.57.0](https://github.com/PIVX-Project/PIVX/pull/1703) | No | | |
  | Clang | | [3.3+](https://llvm.org/releases/download.html) (C++11 support) | | | |
  | D-Bus | [1.10.18](https://cgit.freedesktop.org/dbus/dbus/tree/NEWS?h=dbus-1.10) | | No | Yes | |
  | Expat | [2.2.6](https://libexpat.github.io/) | | No | Yes | |
  