Remove problematic Service field

[GrandMoff100]

Closes #151

[codecov]

Codecov Report

Merging #152 (724e3b8) into dev (dd67030) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head 724e3b8 differs from pull request most recent head a470ee4. Consider uploading reports for the commit a470ee4 to get more accurate results

@@            Coverage Diff             @@
##              dev     #152      +/-   ##
==========================================
- Coverage   99.58%   99.58%   -0.01%     
==========================================
  Files          20       20              
  Lines         965      964       -1     
==========================================
- Hits          961      960       -1     
  Misses          4        4              

Impacted Files	Coverage Δ
homeassistant_api/models/domains.py	100.00% <100.00%> (ø)

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