Timestamps added and min/max removed from templates (#18)

* Removed minimum and maximum from device asset templates

* Ignore coverage report directory

* Add timestamps if none provided

* pass changed to NotImpementedError

* Wolk init tests

* Updated example

* Removed mention of min and max in descriptions

* Updated version

* Updated package classifiers

* Readme update

* Fixed mqtt tests

* MQTT connectivity service update

* Revert Client.is_connected() changes

Version bump (#16)

Renamed actuator reading types (#14)

* Renamed actuator reading types

* Added space for range actuator