1.1.0

• Read / write a keystore file
• Generate a signature request
• Rename contract APIs remove "_" underscore, example Vote_producerXXX to VoteProducer
• Implement SecurePassword
• CreateAccount will have 1 IOST as default gas pledge
• Fix null exception during Send() when receipt is null
• Implement missing APIs

IOST-1.0.0

• Implement all APIs
• Implement all contracts: System, Economic, Token
• Use grpc+protobuff
• Add TxBuilder helper
• Add server helpers, example Client.NewKorea()
• Support .NetStandard 2.0
• Support .Net45 (see github.com/noypi/iost.cs for limitations)