[fix] 修改是否升级成websocket判断 兼容火狐浏览器

[cuteLittleDevil]

火狐浏览器ws请求时 Connection = [keep-alive, Upgrade]
目前是根据RFC 6455标准例子判断Connection=Upgrade
会导致火狐浏览器ws升级失败
根据RFC 2616修改为Connection包含Upgrade即可

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.04% ⚠️

Comparison is base (6af11b2) 55.95% compared to head (2263c7f) 55.92%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #314      +/-   ##
==========================================
- Coverage   55.95%   55.92%   -0.04%     
==========================================
  Files         132      132              
  Lines       11435    11435              
==========================================
- Hits         6399     6395       -4     
- Misses       4345     4347       +2     
- Partials      691      693       +2     

Files Changed	Coverage Δ
pkg/logic/http_server_handler.go	55.81% <0.00%> (ø)

... and 2 files with indirect coverage changes

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