Pylint: Disable invalid-name

This check causes many false positives, especially for global variables
used in simple scripts.

Looks like this will be fixed in Pylint 2.5.0, though. It's already been
integrated into the main branch:
pylint-dev/pylint@3422e4a

Also see relevant issues that motivated the change:
- pylint-dev/pylint#3111
- pylint-dev/pylint#3132

The latest changelog with the fix mentioned under 2.5.0 changes:
https://github.com/PyCQA/pylint/blob/f2f4e6f42416644471ab003d4df7ecf052c3c411/ChangeLog

.pylintrc

@@ -0,0 +1,13 @@
+[MESSAGES CONTROL]
+
+# Disable the message, report, category or checker with the given id(s). You
+# can either give multiple identifiers separated by comma (,) or put this
+# option multiple times (only on the command line, not in the configuration
+# file where it should appear only once). You can also use "--disable=all" to
+# disable everything first and then reenable specific checks. For example, if
+# you want to run only the similarities checker, you can use "--disable=all
+# --enable=similarities". If you want to run only the classes checker, but have
+# no Warning level messages displayed, use "--disable=all --enable=classes
+# --disable=W".
+disable=
+    invalid-name,