Delete file and insert new

# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
#
# Date:      Thu Jan 18 23:27:37 2018 +0100
#
# On branch master
# Changes to be committed:
#	deleted:    test_app/migrations/0002_new_not_null_field.py
#	new file:   test_app/migrations/0003_new_nullable_field.py
#	modified:   test_app/models.py
#
# Untracked files:
#	git/
#
