Update README

[0xethsign]

This will avoid async runtime multiple importing issues.

Fix: #25

[hsluoyz]

@hackerchai please review. Also can you help see why the CI failed?

[codecov-io]

Codecov Report

Merging #26 (db51640) into master (d381180) will increase coverage by 0.40%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
+ Coverage   80.71%   81.11%   +0.40%     
==========================================
  Files           4        4              
  Lines         140      143       +3     
==========================================
+ Hits          113      116       +3     
  Misses         27       27              

Impacted Files	Coverage Δ
tests/test_set_enforcer.rs	93.54% <0.00%> (+0.21%)	⬆️
tests/test_middleware.rs	93.33% <0.00%> (+0.22%)	⬆️
tests/test_middleware_domain.rs	92.85% <0.00%> (+0.26%)	⬆️

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[0xethsign]

I think this works now.

[hackerchai]

lgtm

[0xethsign]

I think #25 can be closed now