rubocop-ast-move

# Refers to https://github.com/rubocop-hq/rubocop/pull/6686#discussion_r264747095
cd rubocop
git subtree split -P lib/rubocop/ast -b lib/ast
git subtree split -P spec/rubocop/ast -b spec/ast

cd ..
mkdir rubocop-astx
cd rubocop-astx

git init
git fetch ../rubocop lib/ast
git checkout -b master FETCH_HEAD
mkdir -p lib/ast
mv *.rb lib/ast
mv node lib/ast
# -> commit

git fetch ../rubocop spec/ast
git checkout -b specs FETCH_HEAD
mkdir -p spec/lib/ast
mv *.rb spec/lib/ast
# -> commit

git checkout master
git checkout -b moving-ast
git merge specs --allow-unrelated-histories
# -> add origin repo and push it