Merge bitcoindevkit/bdk#1610: Bump bdk_wallet version to 1.0.0-beta.4

b34b7778f44be05827fde84660f6b1ee144d9845 Bump bdk_wallet version to 1.0.0-beta.4 (Steve Myers)

Pull request description:

  Bump bdk_wallet version to 1.0.0-beta.4

  bdk_core to 0.2.0
  bdk_chain to 0.19.0
  bdk_bitcoind_rpc to 0.15.0
  bdk_electrum to 0.18.0
  bdk_esplora to 0.18.0
  bdk_file_store to 0.16.0
  bdk_testenv to 0.9.0

ACKs for top commit:
  ValuedMammal:
    ACK b34b7778f44be05827fde84660f6b1ee144d9845

Tree-SHA512: 0dd33aca0a35adff263225678767500b0890caff1326085aa09333692e3e70095cac42b6686f1db9abc63e769326d7d4fc418d861c48ec184c877be00715b0ea