Add under_maintenance component status

[crazy-max]

No description provided.

[codecov]

Codecov Report

Merging #31 (9c7de2c) into master (108b6ec) will increase coverage by 3.47%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #31      +/-   ##
==========================================
+ Coverage   78.57%   82.05%   +3.47%     
==========================================
  Files           2        2              
  Lines          42       39       -3     
  Branches        7        5       -2     
==========================================
- Hits           33       32       -1     
+ Misses          4        2       -2     
  Partials        5        5              

Impacted Files	Coverage Δ
src/githubstatus.ts	80.55% <100.00%> (+3.63%)	⬆️

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