V Cold Wallet

1. Support base58 description when send v coin
2. Minor bugs fixed

V Cold Wallet

1. Upgrade Android SDK to 28

2. Minor issues fixed:

• Fix time display issue
• Change attachment display to decoded text
• Accept string type amount in QRCode

V Cold Wallet

Add Smart Contract Transaction Support:

• Add Register Contract Support

• Add Execute Contract Support

V Cold Wallet

1. Support QR code API version 2
2. Fix Precision Issue for large amount

V Cold Wallet

Main features:

• Securely store your private keys on an offline mobile device
• Generate a new wallet or import an old one
• Export accounts to the web client and sign transactions via QR code
• Backup encrypted wallet data file
• Monitor your network connection

New feature:

• Update QRCode format to JSON

V Cold Wallet

Init commit