Compatibility with latest ESP8266 frameworks

[Martin-Laclaustra]

Now it is required that interrupt routines are declared in cache.
A fix similar to that in rc-switch is needed here:

#if defined(ESP8266) || defined(ESP32)
    // interrupt handler and related code must be in RAM on ESP8266,
    #define RECEIVE_ATTR ICACHE_RAM_ATTR
#else
    #define RECEIVE_ATTR
#endif

and in:

SimpleRcScanner/htdocs/Sketchbook/SimpleRcScanner.ino

Line 53 in bbe88c9

void handleInterrupt() {

RECEIVE_ATTR void handleInterrupt() {