change kAirtonMaxTemp from 25C to 31C #804

Job	Run time
Gen_Matrix	4s
Build_Example (.)	2m 31s
Build_Example (./examples/CommonAcControl)	1m 48s
Build_Example (./examples/IRrecvDump)	1m 25s
Build_Example (./examples/TurnOnMitsubishiHeavyAc)	1m 26s
Build_Example (./examples/TurnOnTrotecAC)	1m 20s
Build_Example (./examples/DumbIRRepeater)	1m 27s
Build_Example (./examples/IRMQTTServer)	4m 3s
Build_Example (./examples/IRrecvDumpV2)	7m 8s
Build_Example (./examples/SmartIRRepeater)	2m 12s
Build_Example (./examples/Web-AC-control)	1m 32s
Build_Example (./examples/IRServer)	1m 27s
Build_Example (./examples/TurnOnFujitsuAC)	1m 23s
Build_Example (./examples/IRrecvDumpV3)	6m 51s
Build_Example (./examples/TurnOnArgoAC)	1m 23s
Build_Example (./examples/TurnOnToshibaAC)	1m 33s
Build_Example (./examples/TurnOnPanasonicAC)	1m 32s
Build_Example (./examples/JVCPanasonicSendDemo)	1m 22s
Build_Example (./examples/TurnOnKelvinatorAC)	1m 34s
Build_Example (./examples/IRGCSendDemo)	1m 21s
Build_Example (./examples/TurnOnMitsubishiAC)	1m 20s
Build_Example (./examples/LGACSend)	1m 32s
Build_Example (./examples/ControlSamsungAC)	1m 35s
Build_Example (./examples/BlynkIrRemote)	1m 37s
Build_Example (./examples/IRsendProntoDemo)	1m 28s
Build_Example (./examples/IRrecvDemo)	1m 24s
Build_Example (./examples/IRsendDemo)	1m 35s
Build_Example (./examples/TurnOnDaikinAC)	1m 22s
Build_Example (./examples/IRGCTCPServer)	1m 27s
Build_Example (./examples/TurnOnGreeAC)	1m 32s
Build_Examples	1s
	58m 15s

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