suppress warning

[technote-space]

git init '.'

Warning: >> hint: Using 'master' as the name for the initial branch. This default branch name
Warning: >> hint: is subject to change. To configure the initial branch name to use in all
Warning: >> hint: of your new repositories, which will suppress this warning, call:
Warning: >> hint:
Warning: >> hint: git config --global init.defaultBranch
Warning: >> hint:
Warning: >> hint: Names commonly chosen instead of 'master' are 'main', 'trunk' and
Warning: >> hint: 'development'. The just-created branch can be renamed via this command:
Warning: >> hint:
Warning: >> hint: git branch -m