rubytree 2.1.0

• bundler 2.5.23 ~> 2.3

• rake 13.2.1 ~> 13.2

• rdoc 6.8.1 ~> 6.7

• rspec 3.13.0 ~> 3.0, > 3.10

• rtagstask 0.0.4 ~> 0.0.4

• rubocop 1.69.0 ~> 1.65

• rubocop-rake 0.6.0 ~> 0.6

• rubocop-rspec 3.2.0 ~> 3.0

• simplecov 0.22.0 ~> 0.22

• simplecov-lcov 0.8.0 ~> 0.8

• test-unit 3.6.3 ~> 3.6

• yard 0.9.37 ~> 0.0, >= 0.9.36