2.3.0

• added socket_set_broadcast function (#190)
• fixed sha1_update call (#194)
• fixed 0x7F detection in utf8 functions
• changed date_get_tz to take an argument (a timestamp), and to return minutes instead of seconds (#195)
• added date_utc_format, date_get_utc_day, and date_get_utc_hours - all variants of existing functions, but using gmtime_r instead of localtime_r (#195)