airhumidifier: add supported models

[rytilahti]

Mentioned in #1199

[codecov-commenter]

Codecov Report

Merging #1201 (c896fc9) into master (72cd423) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1201      +/-   ##
==========================================
+ Coverage   78.47%   78.48%   +0.01%     
==========================================
  Files          89       89              
  Lines        9672     9674       +2     
  Branches     1130     1130              
==========================================
+ Hits         7590     7593       +3     
  Misses       1893     1893              
+ Partials      189      188       -1     

Impacted Files	Coverage Δ
miio/airhumidifier.py	90.09% <100.00%> (+0.09%)	⬆️
miio/device.py	54.48% <0.00%> (+0.68%)	⬆️

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[rytilahti]

Superseded by #1202