**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 responseBuffer = [];
        stream.on('data', function handleStreamData(chunk) {
          responseBuffer.push(chunk);
          
          if (config.maxContentLength > -1 && Buffer.concat(responseBuffer).length > config.maxContentLength) {
            stream.destroy();
            reject(createError('maxContentLength size of ' + config.maxContentLength + ' exceeded',
              config, null, lastRequest));
          }
        });
        stream.on('error', function handleStreamError(err) {
          if (req.aborted) return;
          reject(enhanceError(err, config, null, lastRequest));
        });
        stream.on('end', function handleStreamEnd() {
          var responseData = Buffer.concat(responseBuffer);
          if (config.responseType !== 'arraybuffer') {
            responseData = responseData.toString(config.responseEncoding);
          }
          response.data = responseData;
          settle(resolve, reject, response);
        });
      }
    });
    
    req.on('error', function handleRequestError(err) {
      if (req.aborted && err.code !== 'ERR_FR_TOO_MANY_REDIRECTS') return;
      reject(enhanceError(err, config, null, req));
    });