Add uptime sensor

[tpjanssen]

Added uptime sensor

[tpjanssen]

@dermotduffy @NickM-27 Not sure why the tests are failing... Is this something I have to fix?

[NickM-27]

You have to add a test that tests the unhappy path. It is referring to

            except (TypeError, ValueError):
                pass

[tpjanssen]

You have to add a test that tests the unhappy path. It is referring to

            except (TypeError, ValueError):
                pass

Fixed. Thanks for pointing this out.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (8affacb) to head (862eada).
Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #820   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           17        17           
  Lines         2140      2173   +33     
=========================================
+ Hits          2140      2173   +33     

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[dermotduffy]

Thanks @tpjanssen !