Merge pull request #2714 from searx/dependabot/pip/master/pylint-2.7.4

Bump pylint from 2.7.2 to 2.7.4

requirements-dev.txt

@@ -2,7 +2,7 @@ mock==4.0.3
 nose2[coverage_plugin]==0.10.0
 cov-core==1.15.0
 pycodestyle==2.6.0
-pylint==2.7.2
+pylint==2.7.4
 splinter==0.14.0
 transifex-client==0.14.2
 selenium==3.141.0