v2.0.1.201812

What's new:

• Fix connection issue
• Android TLS 1.2
• Contactless activated event
• Callback from connectToLastActiveReader when the user selects find another reader
• Allow negative item amount, tax and quantity cannot be negative
• Add missing header
• Instrumentation events added
• Added a new API to get list of paired bluetooth devices: getPairedBluetoothDevices