Fix for actix-web 4.0.1

[thespooler]

Fix: #27

Fix: #31

[casbin-bot]

@smrpn @hackerchai @PsiACE @GopherJ please review

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Merging #33 (b371571) into master (1a79901) will decrease coverage by 1.25%.
The diff coverage is 35.71%.

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
- Coverage   81.11%   79.86%   -1.26%     
==========================================
  Files           4        4              
  Lines         143      149       +6     
==========================================
+ Hits          116      119       +3     
- Misses         27       30       +3     

Impacted Files	Coverage Δ
tests/test_middleware.rs	93.54% <ø> (+0.21%)	⬆️
tests/test_set_enforcer.rs	93.75% <ø> (+0.20%)	⬆️
src/middleware.rs	57.89% <35.71%> (-3.22%)	⬇️
tests/test_middleware_domain.rs	93.10% <0.00%> (+0.24%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 1a79901...b371571. Read the comment docs.

[hsluoyz]

@PsiACE

[hackerchai]

lgtm