4.0.0 20170303
* Add define to remove config migration code for versions below 3.0 (See
Wiki-Upgrade-Migration path)
* Free memory by switching from String to char[]
* Raised Sonoff Led PWM frequency from 200Hz to 432Hz in search of
stability (hardware watchdog timeouts) (#122)
* Increase message size and suggested minimum MQTT_MAX_PACKET_SIZE to
512 (#114, #124)
* Remove runtime warning message regarding MQTT_MAX_PACKET_SIZE too
small as it is now moved to compile time (#124)
* Fix possible panics with web console and http commands while UDP
syslog is active (#127)
* Add optional static IP address (#129)
* Add define ENERGY_RESOLUTION in user_config.h to allow user control
over precision (#136)
3.9.22 20170228
* Update web console
* Fix Status 4 JSON message
* Add Exception info during restart if available
* Add osWatch service to detect loop hangs that might happen during
(OTA) upgrades
* Add WiOn support for relay and switch only (#82, #102)
* Allow for user specified relay count up to four in sonoff_template.h
(#109)
* Add support for HTU21 compatible I2C sensors SI7013, SI7020 and SI7021
(#118)
* Add NodeMCU or Wemos configuration option (#119)
3.9.21 20170224
* Add ajax to web root page and web console (#79)
* Add commands SwitchMode1..4 and enable user switches 2, 3 and 4 (#84,
#88)
* Fix MQTT upgrade when webserver is active
arendst