### 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
});
  it('should respect the timeoutErrorMessage property', function (done) {
    server = http.createServer(function (req, res) {
      setTimeout(function () {
        res.end();
      }, 1000);
    }).listen(4444, function () {
      var success = false, failure = false;
      var error;
      axios.get('http://localhost:4444/', {
        timeout: 250,
        timeoutErrorMessage: 'oops, timeout',
      }).then(function (res) {
        success = true;
      }).catch(function (err) {
        error = err;
        failure = true;
      });
      setTimeout(function () {
        assert.strictEqual(success, false, 'request should not succeed');
        assert.strictEqual(failure, true, 'request should fail');
        assert.strictEqual(error.code, 'ECONNABORTED');
        assert.strictEqual(error.message, 'oops, timeout');
        done();
      }, 300);
    });
  });
  it('should allow passing JSON', function (done) {
    var data = {
      firstName: 'Fred',