* fix: global installation always works now
Close#711
* refactor: avoid using `read-pkg-up`
BREAKING CHANGE:
API should be called in the folder that has a package.json file.
pnpm won't search up for a package.json file.
Close#67
* docs(API): update
* refactor: write-pkg created dir on its own
* refactor: rename `globalDir` to `globalPrefix`
* feat: saving the global package in <global prefix>/pnpm-global