Added info on semantic versioning and branching strategy to CONTRIBUTING.md

Also:
- Added isort to Pipenv dev
- Added setup.cfg to make it easy to run flake8, doc8, and isort directly from the command line without using invoke
- Ran isort to sort includes

1 files changed, 0 insertions, 1 deletions

diff --git a/examples/hooks.py b/examples/hooks.py
index 409c8979..f8079e58 100755
--- a/examples/hooks.py
+++ b/examples/hooks.py
@@ -10,7 +10,6 @@ follow a command without any intervening whitespace.
 """
 
 import re
-
 from typing import List
 
 import cmd2