rake and bootstrap commands are not working

[kamataryo]

works as if current directory is monorepo root.

$ bundle init
$ echo 'gem "monorepo"' >> ./Gemfile
$ bundle install
$ bundle exec monorepo bootstrap
executing `bundle` at gems/gem1...
/Users/kamataryo/Desktop/monorepo-test/gems/gem1
Using bundler 1.16.1
Using thor 0.20.0
Using monorepo 0.1.2
Bundle complete! 1 Gemfile dependency, 3 gems now installed.
Bundled gems are installed into `./vendor/bundler`
executing `bundle` at gems/gem0...
/Users/kamataryo/Desktop/monorepo-test/gems/gem0
Using bundler 1.16.1
Using thor 0.20.0
Using monorepo 0.1.2
Bundle complete! 1 Gemfile dependency, 3 gems now installed.
Bundled gems are installed into `./vendor/bundler`

Below command works well.

/path/to/monorepo/development/directory/exec/monorepo bootstrap

[kamataryo]

It works as a global gem.

$ gem install monorepo
$ monorepo bootstrap

This leads that it is a issue with case of bundle exec monorepo.