#### Summary

It looks like latest version includes `buffer.js` on the browser bundle even if not actually used.
This makes axios bundle size **3 times bigger**, adding 22kB to the minified size (0.16.0 is 11.9 KB while 0.16.1 is 33.9kB).

#### Context

- axios version: v0.16.1

lib/adapters/http.js
transport = isHttps ? httpsFollow : httpFollow;
    }
    
    var req = transport.request(options, function handleResponse(res) {
      if (aborted) return;
      
      clearTimeout(timer);
      timer = null;
      
      var stream = res;
      switch (res.headers['content-encoding']) {
      
      case 'gzip':
      case 'compress':
      case 'deflate':
        
        stream = stream.pipe(zlib.createUnzip());
        
        delete res.headers['content-encoding'];
        break;
      }
      
      var lastRequest = res.req || req;
      var response = {
        status: res.statusCode,
        statusText: res.statusMessage,
        headers: res.headers,
        config: config,
        request: lastRequest
      };