### 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
}).then(function (res) {
        success = true;
      }).catch(function (err) {
        error = err;
        failure = true;
      }).then(function () {
        assert.strictEqual(success, false, 'request should not succeed');
        assert.strictEqual(failure, true, 'request should fail');
        assert.strictEqual(error.code, 'ERR_BAD_RESPONSE');
        assert.strictEqual(error.message, 'maxContentLength size of -1 exceeded');
        done();
      }).catch(done);
    });
  });
  it('should able to cancel multiple requests with CancelToken', function(done){
    server = http.createServer(function (req, res) {
      res.end('ok');
    }).listen(4444, function () {
      var CancelToken = axios.CancelToken;
      var source = CancelToken.source();
      var canceledStack = [];
      var requests = [1, 2, 3, 4, 5].map(function(id){
        return axios
          .get('/foo/bar', { cancelToken: source.token })
          .catch(function (e) {
            if (!axios.isCancel(e)) {
              throw e;
            }
            canceledStack.push(id);
          });