Currently, "Json" is converted into "json" with this [method](https://github.com/Helioviewer-Project/python-api/pull/21/files#diff-4b73abe47d9fc20a0302a0d4645d7382941a58a31282104e86ce5349e70ae541R9).
Currently, "Json" is converted into "json" with this method.