**Is your feature request related to a problem? Please describe.**
It's frustrating there's no option to turn off decompress. There are situations where you want to do this. Ex: having a service that collects data, but doesn't analyze it. which then passes to another service immediately/eventually.

While data is waiting or in traffic to next stop, it should stay compressed. The difference in byte size is huge (for me, 60MB vs 1-2MB). 

**Describe the solution you'd like**
Add an option to the request to not automatically decompress for me. I'm a big boy, I can handle it myself later.

**Describe alternatives you've considered**
There are none except user another lib or write own http req (which is ridiculous just to turn off a auto feature).


I can submit a PR if no one else wants to do it (it's not hard to add). But let me know how you'd like the option to be passed in? An extra options key? `axios({ url: ..., method: ..., decompress: false })` , or adding option to an existing option?


lib/adapters/http.js
}
    
    var req = transport.request(options, function handleResponse(res) {
      if (req.aborted) return;
      
      var stream = res;
      
      var lastRequest = res.req || req;
      switch (res.headers['content-encoding']) {
      
      case 'gzip':
      case 'compress':
      case 'deflate':
        
        stream = (res.statusCode === 204 || lastRequest.method === 'HEAD') ? stream : stream.pipe(zlib.createUnzip());
        
        delete res.headers['content-encoding'];
        break;
      }
      var response = {
        status: res.statusCode,
        statusText: res.statusMessage,
        headers: res.headers,
        config: config,
        request: lastRequest
      };
      if (config.responseType === 'stream') {
        response.data = stream;
        settle(resolve, reject, response);
      } else {