CheckRequestState API support

[wazofski]

• minor fix in ResolveClass (python3 support)

[codecov]

Codecov Report

Merging #49 into master will decrease coverage by 0.43%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
- Coverage   67.57%   67.14%   -0.44%     
==========================================
  Files           8        8              
  Lines        1101     1120      +19     
==========================================
+ Hits          744      752       +8     
- Misses        357      368      +11     

Impacted Files	Coverage Δ
pyaci/core.py	71.91% <40.00%> (-0.74%)	⬇️

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[kprav33n]

@wazofski Thank you for the contribution. Can we add a test for it and amend the PR?