message: Bump ElectrsCash HEAD commit hash
  A new commit was pushed to the v2.0 branch of ElectrsCash to fix an
  crates dependency issue.
diff: @@ -11,7 +11,7 @@ GIT_REPO = "https://github.com/BitcoinUnlimited/{}.git".format(PROJECT_NAME)
  GIT_BRANCH = "v2.0.0"
  # When released put a hash here: "aa95d64d050c286356dadb78d19c2e687dec85cf"
  # When in development, put 'None' here
  -EXPECT_HEAD = "7dc599c09bf2f7604e2bdd7ecf613381c77e3092"
  +EXPECT_HEAD = "6cf6a66b5bc5ce38d3116812d4f32457984a975e"
  ROOT_DIR = os.path.realpath(
  os.path.join(os.path.dirname(__file__), os.pardir, os.pardir))
  