测试验证 Tools.convert_js_to_dict 例子异常

[WheatMaThink]

使用readme.md 例子测试convert_js_to_dict 异常

from chartspy import Echarts, Tools, Js

js_str = """
{
    xAxis: {
        type: 'category',
        data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
    },
    yAxis: {
        type: 'value'
    },
    series: [{
        data: [820, 932, 901, 934, 1290, 1330, 1320],
        type: 'line',
        smooth: true
    }]
}
"""
options = Tools.convert_js_to_dict(js_str, print_dict=False)
Echarts(options, height='300px', width='300px').render_notebook()

异常信息：
raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 3 column 16 (char 31)