fix: rtmp generate url

[binghaiwang]

fix rtmp generate sign url

[codecov-io]

Codecov Report

Merging #463 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #463   +/-   ##
=======================================
  Coverage   96.67%   96.67%           
=======================================
  Files          12       12           
  Lines        1413     1413           
  Branches      270      270           
=======================================
  Hits         1366     1366           
  Misses         47       47

Impacted Files	Coverage Δ
lib/client.js	92.88% <100%> (ø)	⬆️

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