Added windowSize for ListSymbolTickerService

[tgbv]

Addresses issue #406

Added windowSize request parameter for ListSymbolTickerService

[codecov[bot]]

Codecov Report

Merging #407 (4e8e62f) into master (0ded954) will decrease coverage by 0.22%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #407      +/-   ##
==========================================
- Coverage   70.22%   70.00%   -0.23%     
==========================================
  Files          70       74       +4     
  Lines        6644     6824     +180     
==========================================
+ Hits         4666     4777     +111     
- Misses       1488     1548      +60     
- Partials      490      499       +9     

Impacted Files	Coverage Δ
v2/ticker_service.go	75.23% <100.00%> (+1.23%)	:arrow_up:
v2/futures/client.go	75.98% <0.00%> (-0.29%)	:arrow_down:
v2/futures/mark_price_kline_service.go	85.41% <0.00%> (ø)
v2/futures/longshort_ratio_service.go	88.57% <0.00%> (ø)
v2/bnb_burn_service.go	76.47% <0.00%> (ø)
v2/futures/index_price_kline_service.go	0.00% <0.00%> (ø)
v2/client.go	80.81% <0.00%> (+0.24%)	:arrow_up:

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[adshao]

hi @tgbv , please check the comment