add end_time to read_ts_channel_basic_info

[SweetVlad]

Feature request

• add end uutc timestamp in function 'read_ts_channel_basic_info'
• updated function:

  # Check if path exists
    if not os.path.exists(session_path):
        raise FileNotFoundError(session_path+' does not exist!')

    check_password(session_path, password)

    session_ts_md = pymef3_file.read_mef_session_metadata(session_path,
                                                          password, False)

    channel_list = list(session_ts_md['time_series_channels'].keys())
    channel_list.sort()

    channel_infos = []
    for channel in channel_list:

        channel_md = session_ts_md['time_series_channels'][channel]
        channel_md_spec = channel_md['channel_specific_metadata']
        channel_md_s2 = channel_md['section_2']

        fsamp = channel_md_s2['sampling_frequency']
        nsamp = channel_md_s2['number_of_samples']
        ufact = channel_md_s2['units_conversion_factor']
        unit = channel_md_s2['units_description']
        start_time = channel_md_spec['earliest_start_time']
        ch_desc = channel_md_s2['channel_description']
        end_time = channel_md_spec['latest_end_time']
        channel_infos.append({'name': channel, 'fsamp': fsamp, 'nsamp': nsamp,
                              'ufact': ufact, 'unit': unit,
                              'start_time': start_time,
                              'channel_description': ch_desc,
                              'end_time': end_time})

    return channel_infos