remove the active_support dependencies

[JacksonTian]

You need to complete

• unit tests and/or feature tests
• documentation is changed or added

[codecov-io]

Codecov Report

Merging #22 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #22   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           3      3           
  Lines         174    174           
=====================================
  Hits          174    174

Impacted Files	Coverage Δ
lib/aliyunsdkcore/roa_client.rb	100% <100%> (ø)	⬆️

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