v0.9.0-rc0

BREAKING CHANGES:

• Use iristool to replace the original irisdebug and irismon
• iris init must specify moniker

FEATURES:

• [iriscli] Optimize the way tags are displayed
• [iriscli] Add iriscli stake delegations-to [validator-addr] and /stake/validators/{validatorAddr}/delegations interfaces
• [iris] Application framework code refactoring
• [iris] Add a new mechanism to distribute service fee tax
• [iris] Slashing module supports querying slashing history
• [iris] Gov module adds TxTaxUsageProposal/SoftwareHaltProposal proposals
• [iris] Export and import blockchain snapshot at any block height
• [iris] Redesigned to implement class 2 software upgrade
• [iris] Restrict the block gas limit
• [iris] Improve tx search to support multiple tags
• [iris] Improve the default behavior of iris --home
• [iris] iris tendermint show-address output begins with fca
• [iris] Restrict the number of signatures on the transaction
• [iris] Add a check for the validator private key type and reject the unsupported private key type
• [tendermint] Update tendermint to v0.27.0

BUG FIXES:

• Add chain-id value checking for sign command
• Specify the required flags for cmds query-proposal, query-deposit and query-vote