Feature request: `attw --from-npm <pkg-name>` use `$(npm config get registry)` as its default registry

Currently, for me, my npm registy is `https://registry.npmmirror.com`, not `https://registry.npmjs.org`. But running `attw --from-npm ` still fetch from the default npm registry. IMO, there are 2 solutions:

- allow `--registry` option for `attw` cmd.
- if not pass `--registry` option to `attw` cmd, use the result of `$(npm config get registry)` by default

首先跟踪 `attw --from-npm ` 命令以及它如何选择 npm registry；将其与 `npm config get registry` 返回的值进行比较。在支持显式的 `--registry`，或省略该选项时使用已配置的 npm registry，并验证这两种情况下的行为后，工作即完成。

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