Pywirelessmbus

Fix
* **main:** Update pyhton deps

Fix
* **main:** Expand python deps to 3.7 ([`0254787`](https://github.com/gewv-tu-dresden/pyWirelessMbus/commit/025478759d683b90abce7966ab1bf381db41d39c))

Feature
* **device:** Add a ctx property to devices to store informations ([`6c9b2ac`](https://github.com/gewv-tu-dresden/pyWirelessMbus/commit/6c9b2ac4aa87e99cfbf2c49506663cda9d5d9654))

Fix
* **ci:** Linting and tests are required ([`1b9a673`](https://github.com/gewv-tu-dresden/pyWirelessMbus/commit/1b9a6736878bb100b7db4a38ba417a229b7230bc))

Fix
* **tests:** Wrong assertion for value type ([`c2f623e`](https://github.com/gewv-tu-dresden/pyWirelessMbus/commit/c2f623e4c0069308b46eeae13f467c8a275fc830))

Feature
* **main:** Values of messages have now a specific type ([`f342181`](https://github.com/gewv-tu-dresden/pyWirelessMbus/commit/f342181b5cc0059bc3573230f58aa674da8ecd52))

Fix
* **main:** Export value type ([`52ee149`](https://github.com/gewv-tu-dresden/pyWirelessMbus/commit/52ee14987b236b88a25eb0aeef8c28d4a0fe3248))