#403 - Added support for GET /api/v3/ticker

[tgbv]

Addresses issue #403

• Added .gitattributes to prevent the git of other platforms from modifying files line ending (Windows Git is known for doing that). I set it to LF since it's wide compatible.
• Added new service: ListSymbolTickerService
• Added test case for the new service

[codecov[bot]]

Codecov Report

Merging #404 (d5eff4e) into master (92fe7c9) will decrease coverage by 0.03%. The diff coverage is 61.53%.

@@            Coverage Diff             @@
##           master     #404      +/-   ##
==========================================
- Coverage   70.26%   70.22%   -0.04%     
==========================================
  Files          70       70              
  Lines        6618     6644      +26     
==========================================
+ Hits         4650     4666      +16     
- Misses       1481     1488       +7     
- Partials      487      490       +3     

Impacted Files	Coverage Δ
v2/ticker_service.go	74.00% <58.33%> (-4.95%)	:arrow_down:
v2/client.go	80.57% <100.00%> (+0.12%)	:arrow_up:

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[tgbv]

@adshao I think other pull requests are also failing because of missing .gitattributes aka CRLF / LF conversion

[adshao]

@adshao I think other pull requests are also failing because of missing .gitattributes aka CRLF / LF conversion

thanks for the great work