add only_media parameter in public timeline, add method get custome emojis

[RanKKI]

#81

[codecov-io]

Codecov Report

Merging #76 into master will decrease coverage by 0.33%.
The diff coverage is 12.5%.

@@             Coverage Diff              @@
##             master      #76      +/-   ##
============================================
- Coverage      49.6%   49.26%   -0.34%     
  Complexity      148      148              
============================================
  Files            47       47              
  Lines           877      883       +6     
  Branches         95       96       +1     
============================================
  Hits            435      435              
- Misses          425      430       +5     
- Partials         17       18       +1

Impacted Files	Coverage Δ	Complexity Δ
.../java/com/sys1yagi/mastodon4j/api/method/Public.kt	70.73% <12.5%> (-12.13%)	7 <1> (ø)

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