Would add the following to sub_dir/go.mod: 2.0.0
Would add the following to CHANGELOG.md: 
## 2.0.0 ([DATE])

### Breaking Changes

#### Breaking change

Would add files to git:
  sub_dir/go.mod
  CHANGELOG.md
Would create Git tag v2.0.0
Would create Git tag sub_dir/v2.0.0
