update revisions.txt

Author: facchinm

build/shared/revisions.txt

@@ -22,6 +22,8 @@ ARDUINO 1.6.5
 * AVR: delayMicroseconds(..), added support for 1Mhz, 12Mhz and 24Mhz. Thanks @cano64
 * AVR: added missing case in detachInterrupt(). Thanks @leres, @vicatcu
 * SAM: added watchdog routine for Due. Thanks @bobc
+* AVR+SAM: reworked pulseIn() function to become GCC agnostic
+* AVR+SAM: added pulseInLong() (based on micros()) to help getting good results in interrupt-prone environments
 
 ARDUINO 1.6.4 - 2015.05.06