refactor: use vim.system instead of pleanry (#85)

* refactor!: migrate to vim.system

* refactor(gotests): use vim.system

* refactor(iferr): use vim.system

* refactor(impl): use vim.system

* refactor(installer): use vim.system and add sync mode

* test: fix gotests' tests

* refactor(struct_tags): use vim.system

* chore(ci): install all deps explicitly

* refactor(installer)!: add sync as an option

* docs: update readme

spec/fixtures/impl/reader_output.go

@@ -4,5 +4,4 @@ func (r Read2) Read(p []byte) (n int, err error) {
 	panic("not implemented") // TODO: Implement
 }
 
-
 type Read2 struct{}