add options shortcut

[RobinTsai]

add OPTIONS shortcut WebService receiver

#454

[codecov-io]

Codecov Report

Merging #455 into master will decrease coverage by 0.05%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #455      +/-   ##
==========================================
- Coverage   71.30%   71.25%   -0.06%     
==========================================
  Files          25       25              
  Lines        1199     1200       +1     
==========================================
  Hits          855      855              
- Misses        274      275       +1     
  Partials       70       70              

Impacted Files	Coverage Δ
web_service.go	67.85% <0.00%> (-0.82%)	⬇️

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[RobinTsai]

@emicklei There is the PR for #454 .

I reviewed the test file, and seems there isn't any proper test case to be added. Any suggestion?

[RobinTsai]

Added test.

[RobinTsai]

@emicklei Hey buddy, how is it going