message: [doc] Update dependencies.md
  test_framework/cashlib/cashlib.py IntFlag which is imported
  from the enum package, has been added in Python 3.6. Before
  it wasn't available
  [skip ci]
diff: @@ -21,7 +21,7 @@ These are the dependencies currently used by Bitcoin Unlimited. You can find ins
  | OpenSSL | [1.0.1k](https://www.openssl.org/source) | | Yes | | |
  | PCRE | | | | | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk#L76) |
  | protobuf | [2.6.3](https://github.com/google/protobuf/releases) | | No | | |
  -| Python (tests) | | [3.4](https://www.python.org/downloads) | | | |
  +| Python (tests) | | [3.6](https://www.python.org/downloads) | | | |
  | qrencode | [3.4.4](https://fukuchi.org/works/qrencode) | | No | | |
  | Qt | [5.9.7](https://download.qt.io/official_releases/qt/) | 5.3+ | No | | |
  | XCB | | | | | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk#L94) (Linux only) |
  