add Xiaomi Mi Mix 2

[mimmi20]

Fixes #1858.

[codecov]

Codecov Report

Merging #1867 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1867      +/-   ##
============================================
+ Coverage     50.04%   50.05%   +<.01%     
  Complexity      764      764              
============================================
  Files          1647     1647              
  Lines         59462    59468       +6     
  Branches      26422    26424       +2     
============================================
+ Hits          29760    29766       +6     
  Misses        29702    29702

Flag	Coverage Δ	Complexity Δ
#full	44.46% <100%> (ø)	0 <0> (ø)	⬇️
#lite	2.11% <0%> (-0.01%)	0 <0> (ø)
#standard	25.75% <0%> (-0.01%)	0 <0> (ø)

Impacted Files	Coverage Δ	Complexity Δ
...r-agents/browsers/chrome/chrome-android-43-on.json	84.06% <100%> (+0.1%)	0 <0> (ø)	⬇️

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