add BLEDevice::addToDisconnectionCallChain()
make use of getValueHandle() as a short cut.
Release 0.2.8
=============

Minor API enhancements to support LinkLoss service.

Enhancements
~~~~~~~~~~~~

* Introduce LinkLoss Service.
  https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.link_loss.xml

* Add BLEDevice::addToDisconnectionCallChain(). This is in some sense parallel
  to the onDisconnection callback; but it allows for chaining and these
  callbacks don't receive any context.

* Some improvements to documentation.

Bugfixes
~~~~~~~~

Compatibility
~~~~~~~~~~~~~

This release is backward compatible with 0.2.4.