Fallback in "Range" for pagination requests

[emmanvg]

implement equivalent changes as initially thought by @teizenman

Closes #82

[codecov-commenter]

Codecov Report

Merging #84 into master will increase coverage by 0.33%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #84      +/-   ##
==========================================
+ Coverage   94.89%   95.23%   +0.33%     
==========================================
  Files           8        8              
  Lines        1784     1845      +61     
==========================================
+ Hits         1693     1757      +64     
+ Misses         91       88       -3     

Impacted Files	Coverage Δ
taxii2client/test/test_client_v20.py	100.00% <100.00%> (ø)
taxii2client/v20/__init__.py	91.08% <100.00%> (+0.94%)	⬆️
taxii2client/common.py	81.69% <0.00%> (+0.70%)	⬆️

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