Bump pylint from 2.3.1 to 2.4.4

Bumps [pylint](https://github.com/PyCQA/pylint) from 2.3.1 to 2.4.4.
- [Release notes](https://github.com/PyCQA/pylint/releases)
- [Changelog](https://github.com/PyCQA/pylint/blob/master/ChangeLog)
- [Commits](pylint-dev/pylint@pylint-2.3.1...pylint-2.4.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

requirements.txt

@@ -9,7 +9,7 @@ ta==0.4.5
 TA-Lib==0.4.17
 tabulate==0.8.3
 tox==3.13.2
-pylint==2.3.1
+pylint==2.4.4
 pyre-check==0.0.27
 pytest==4.6.3
 pyti==0.2.2