Hello!

I noticed that some of the code in go-json appears to have been copied or derived from work originally done in segmentio/encoding. segmentio/encoding was released under MIT license, which states the following:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

For example, the appendString function in go-json seems to be an improvement of encodeString and escapeIndex in segmentio/encoding.

Let me know if I'm mistaken, but the comments are exactly identical and the code structure very similar.

I would like to ask if you could include the original LICENSE file in go-json to satisfy the license under which the code was originally released.