Pity

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- Fixed a subtle bug when signing a multisig transaction over multiple inputs

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- New: Add `get_transaction_by_id()` calls
- Update default fees
- Multisig improvements

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- New :class:`~bit.MultiSig` adds support for P2SH nested m-of-n multisignature contracts
- Support for sending to P2SH and Bech32 output addresses
- P2SH nested segwit addresses for :class:`~bit.PrivateKey` and :class:`~bit.MultiSig`
- Support for batching transaction inputs from different keys
- Update transaction message length limit to 80

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- Fixed fee calculation when ``combine=False`
- **Breaking:** Exceptions will now be raised when using pay2sh addresses (until implemented)

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- Optimized network API priorities
- Fixed Smartbit pushtx usage
- Updated `21.co <https://www.21.co>`_ to `earn.com <https://www.earn.com>`_

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- Removed ``blockr.io`` network backend as `Coinbase <https://www.coinbase.com>`_ has shut it down.