Updated twistedchecker to use pylint >= 2.4.4

[rodrigc]

• remove local TestReporter, and use pylint.reporters.text.TextReporter
• replace use of node.file_stream (which was deprecated and removed in pylint) with node.stream
• remove dependency on Python 3.5, and allow twistedchecker to run on any Python 3.x
• remove dependency on logilab.common package

[codecov[bot]]

Codecov Report

Merging #141 into master will increase coverage by 0.31%. The diff coverage is 95.74%.

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
+ Coverage   90.94%   91.26%   +0.31%     
==========================================
  Files          25       24       -1     
  Lines        1016     1007       -9     
  Branches      167      165       -2     
==========================================
- Hits          924      919       -5     
+ Misses         62       60       -2     
+ Partials       30       28       -2     

Impacted Files	Coverage Δ
twistedchecker/checkers/header.py	96.00% <80.00%> (+7.53%)	:arrow_up:
twistedchecker/checkers/comment.py	96.77% <94.73%> (+5.86%)	:arrow_up:
twistedchecker/checkers/names.py	87.95% <100.00%> (+0.29%)	:arrow_up:
twistedchecker/core/runner.py	88.88% <100.00%> (-0.12%)	:arrow_down:
twistedchecker/test/test_functionaltests.py	85.71% <100.00%> (+0.48%)	:arrow_up:
twistedchecker/test/test_limitedreporter.py	100.00% <100.00%> (ø)
twistedchecker/test/test_runner.py	100.00% <100.00%> (ø)

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