Adds pre-commit config to run various lintersci_improvements

This ads black, isort, pyupgrade, and flake8 to pre-commit-config.yaml
There are also some small changes to travis.yml and tasks.py to reduce
some repeated configurations that should be consolidated into
setup.cfg. Most other changes are automated by the linter scripts.

1 files changed, 2 insertions, 0 deletions

diff --git a/examples/subcommands.py b/examples/subcommands.py
index dd69d97e..56c91b14 100755
--- a/examples/subcommands.py
+++ b/examples/subcommands.py
@@ -68,6 +68,7 @@ class SubcommandsExample(cmd2.Cmd):
     Example cmd2 application where we a base command which has a couple subcommands
     and the "sport" subcommand has tab completion enabled.
     """
+
     def __init__(self):
         super().__init__()
 
@@ -114,5 +115,6 @@ class SubcommandsExample(cmd2.Cmd):
 
 if __name__ == '__main__':
     import sys
+
     app = SubcommandsExample()
     sys.exit(app.cmdloop())