Merge pull request #549 from searxng/dependabot/pip/master/pylint-2.12.1

Bump pylint from 2.11.1 to 2.12.1

requirements-dev.txt

@@ -2,7 +2,7 @@ mock==4.0.3
 nose2[coverage_plugin]==0.10.0
 cov-core==1.15.0
 pycodestyle==2.8.0
-pylint==2.11.1
+pylint==2.12.1
 splinter==0.16.0
 selenium==3.141.0
 twine==3.6.0