v0.24.9

• Support for update_proposal_operation (thanks to dkedzierski)
• Remove not needed SECP256K1 import
• Fix corner case last_irreversible_block_num == head_block_number for Transactionbuilder (thanks to dkedzierski)
• import keyring only when needed
• Add use_condenser to config (can be set wtih beempy set), when set to False, condenser calls are not used
• Add set_expiration to Object Cache
• Use floor instead of round in beembase/Amount in order to handle floats which have a higher precision than allowed
• json_str parameter has been added to beembase.Amount, when True, a json dict is returned as string (needing when broadcasting with use_condenser=False)
• Handle deleted comments in beempy pending thanks to @crokkon