fix serialize name of Mention.id

[codecov-io]

Codecov Report

Merging #41 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #41   +/-   ##
=========================================
  Coverage     27.89%   27.89%           
  Complexity       60       60           
=========================================
  Files            39       39           
  Lines           509      509           
  Branches         65       65           
=========================================
  Hits            142      142           
  Misses          358      358           
  Partials          9        9

Impacted Files	Coverage Δ	Complexity Δ
...java/com/sys1yagi/mastodon4j/api/entity/Mention.kt	80% <ø> (ø)	1 <0> (ø)	:arrow_down:

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[sys1yagi]

wow