Update write characteristic options

Allow to choose write characteristic .withResponse or .withoutResponse

public func write(_ characteristic: GattCharacteristic,
                      value: DataConvertible,
                      type: CBCharacteristicWriteType = .withResponse,
                      success: @escaping (DataInitializable?) -> Void,
                      error: @escaping (Error?) -> Void)

Add Nevanlinna library

0.3.5

Fix podspec typo issue

Global code improvements

0.3.4

make init public

Refactor using DataConvertible protocol

0.3.3

Update README and add UInt8 DataConvertible.

Update sample project

0.3.2

Update demo project + README

Global fix and improvements

0.3.1

Global fix and improvements

Add Heart Rate Monitor Demo project

0.3.0

Add disconnect BLE on deinit

Complete refactor

0.2.0

Use func for didDiscover block

Initial release

0.1.0

Update config