### Describe the bug

When upgrading from `1.2.0-alpha.1` to just `1.2.0` the config `transformResponse` sends data as binary instead of string.

### To Reproduce

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### Code snippet

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### Expected behavior

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### Axios Version

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### Adapter Version

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### Browser

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### Browser Version

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### Node.js Version

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### OS

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### Additional Library Versions

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### Additional context/Screenshots

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test/unit/adapters/http.js
}).catch(done);
      });
    });
  });
  it('should preserve the HTTP verb on redirect', function (done) {
    server = http.createServer(function (req, res) {
      if (req.method.toLowerCase() !== "head") {
        res.statusCode = 400;
        res.end();
        return;
      }
      var parsed = url.parse(req.url);
      if (parsed.pathname === '/one') {
        res.setHeader('Location', '/two');
        res.statusCode = 302;
        res.end();
      } else {
        res.end();
      }
    }).listen(4444, function () {
      axios.head('http://localhost:4444/one').then(function (res) {
        assert.equal(res.status, 200);
        done();
      }).catch(done);
    });
  });
  describe('compression', () => {
    it('should support transparent gunzip', function (done) {
      var data = {
        firstName: 'Fred',