Don't `require('buffer')`

The buffer implementation is a lot of code and http-browserify does not really need it to work. It is only needed for `auth` parameter to bas64 encode it.

Could it be document that the `auth` parameter is not supported or changed to depend on a base64 library or? Eg. `base64-js` which `buffer-browserify` depends on.

Start by tracing where http-browserify requires buffer and how the auth parameter is handled. Compare the stated options—documenting that auth is unsupported or using a base64 library—and inspect the existing dependency setup before choosing a direction. Done means the buffer dependency is no longer unnecessarily required and the auth behavior is explicit and covered by the project’s existing checks.

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