3.0.0 undocumented breakage - Zip::OutputStream.write_buffer with zip.print broken

`< 3.0.0`, this worked:

```ruby
zip_stream = Zip::OutputStream.write_buffer do |zip|
  zip.put_next_entry(file_name)
  zip.print(file_data)
end
```

`>= 3.0.0`, same errors:

```
Failure/Error: zip.print(file_data)  
Zlib::BufError:
  buffer error
```

Changing from `zip.print` to `zip.write` appears to fix it, but this breakage is undocumented.