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, 3 insertions, 3 deletions

diff --git a/examples/hello_cmd2.py b/examples/hello_cmd2.py
index 94ec334f..7bd0ef2c 100755
--- a/examples/hello_cmd2.py
+++ b/examples/hello_cmd2.py
@@ -7,11 +7,11 @@ from cmd2 import cmd2
 
 if __name__ == '__main__':
     import sys
-    # If run as the main application, simply start a bare-bones cmd2 application with only built-in functionality.
 
+    # If run as the main application, simply start a bare-bones cmd2 application with only built-in functionality.
     # Set "use_ipython" to True to include the ipy command if IPython is installed, which supports advanced interactive
     # debugging of your application via introspection on self.
     app = cmd2.Cmd(use_ipython=True, persistent_history_file='cmd2_history.dat')
-    app.self_in_py = True     # Enable access to "self" within the py command
-    app.debug = True            # Show traceback if/when an exception occurs
+    app.self_in_py = True  # Enable access to "self" within the py command
+    app.debug = True  # Show traceback if/when an exception occurs
     sys.exit(app.cmdloop())