Use rdflib < 5.0.0 as it removed the parsers

[lopuhin]

Fixes #131

[codecov]

Codecov Report

Merging #133 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #133   +/-   ##
=======================================
  Coverage   87.78%   87.78%           
=======================================
  Files          11       11           
  Lines         475      475           
  Branches      103      103           
=======================================
  Hits          417      417           
  Misses         52       52           
  Partials        6        6           

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[kmike]

Thanks @lopuhin!

[lopuhin]

Thanks @kmike , will make a release.