tz_offset is incorrectly documented in the code and documentation

[VPTechOps]

The code describes the tz_offset code as:
:param int tz_offset: The offset of the local timezone,
in seconds west of UTC (negative in most of Western Europe,
positive in the US, zero in the UK).
"""

    try:
        now = self._esp.get_time()
        now = time.localtime(now[0] + tz_offset)

Timezone offset in the US is negative. For example MST7 is -25200.

[ladyada]

OK! please submit a PR if ya can :)