an automatic manipulation of request parameters by using the function "get_historical_klines"

[stein5]

Describe the bug
Even though the parameters start_str and end_str by using the function "get_historical_klines" are put in utc(+0000) timestamp in milliseconds like start_str="1572566400000" and end_str="1572567000000", the response data of the request are the local timezone data(+0900) starting with 1572598800000...
I think two parameters "str_str" and "end_str" in the timestamp format are manipulated to local timezone by requesting.

To Reproduce

request:
client.get_historical_klines("BTCUSDT", Client.KLINE_INTERVAL_1MINUTE, "1572566400000", end_str="1572567000000", limit=500)

response:
[[1572598800000, '9134.63000000', '9136.00000000', '9124.06000000', '9124.29000000', '38.03214700', 1572598859999, '347235.10461681', 415, '13.53411000', '123585.92727641', '0'], [1572598860000, '9124.30000000', '9126.02000000', '9118.10000000', '9121.92000000', '21.02118800', 1572598919999, '191742.91957637', 260, '9.20189600', '83940.02573609', '0'], [1572598920000, '9121.02000000', '9132.21000000', '9118.95000000', '9124.88000000', '31.55935500', 1572598979999, '288020.13766589', 361, '16.46156900', '150229.54058978', '0'],...

Expected behavior
response data that are expected...
[[1572566400000, '9140.86000000', '9141.99000000', '9128.84000000', '9130.69000000', '73.77571600', 1572566459999, '673937.26245627', 304, '42.19302100', '385436.26444131', '0'], [1572566460000, '9130.10000000', '9144.70000000', '9129.73000000', '9130.35000000', '39.60444800', 1572566519999, '361878.05486463', 256, '22.14900800', '202378.77002015', '0'], [1572566520000, '9133.62000000', '9133.62000000', '9125.81000000', '9128.08000000', '33.79200600', 1572566579999, '308489.02942042', 242, '20.25087900', '184886.50938397', '0'],...

Environment (please complete the following information):

• Python version: 3.7.4
• Virtual Env: pyenv virtualenv
• OS: osx
• python-binance version: 0.7.4