Index error for heating appliances

[ISHINJaR]

In the file "appliances.py" line 89 are the indexes of the heating appliances incorrect. They should be [28, 29, 30, 31, 32].

richardsonpy/richardsonpy/classes/appliance.py

Line 89 in 09493d1

if i in [29, 30, 31, 32, 33]: # Idx of heating app.

[JSchiefelbein]

Dear @ISHINJaR, thanks a lot for identifying these issues. Well, I am no longer working for EBC / with richardsonpy.
Please feel free to open a Pull request per issue and assign it to one of the current EBC employees. @larissakuehn @MDHering could you take care if this? Thanks.